SmartDraw lets anyone quickly and easily create professional-looking flowcharts, org-charts, forms, presentations, floor plans, schematics, networks, and much, much more! The new SmartDraw 2007 offers dozens of powerful new features including the ability to draw freeform, add gradient colors, create multiple layers,use ink enabled Tablet PC features, plus SmartDraw 2007 now offers over 20,000 symbols & templates, all of which can be evaluated for free with the SmartDraw 7-day trial.Each of SmartDraw’s symbol and template collection is aimed at a particular drawing discipline: Business & Charting, Floor Plans & Facilities Facilities Design, Electrical Engineering, Mechanical Engineering, Network Design, Software Design, Maps & Geography, Science & Math, Clipart, and more! SmartDraw is truly one of those programs that would be valuable to have in any business or organization.

• Easy to use - no drawing skill required!
• Contains thousands of built-in symbols and clip-art, you simply drag-and-drop into your drawings.
• Import and export drawings in many formats (Word, Excel, Powerpoint, GIF, JPG, EPS, Visio, AutoCAD, and more).
• Draw Freeform - create custom shapes and lines, literally draw anything you can imagine!
• Create Multiple Layers to simplify complex drawings, for example, separate a floor plan into layers for walls.
• Draw huge diagrams with thousands of symbols per drawing.
• Great for presentations: Supports rich text editing. Choose from a library of color schemes and shadow styles for a professional finish.
• Vista Compatible
• Tablet PC Enabled

DOWNLOAD AVAILABLE HERE

* Last Updated: 2008-01-21

Click To Enlarge

* License: Freeware Free
* OS: Windows Vista, 2003, XP, 2000
* Requirements: No special requirements

"HYCAD is a general purpose CAD program, green and small but powerful."
Brothersoft Editor: HYCAD is a general purpose CAD program, green and small but powerful. it can export multiple format files,such as BMP JPG PNG DXF XMG WMF DWG EPS SLD CGM SVG PDF etc. it is easy to be learn and use. you can free download HYCAD 5.35 now.

Create, export and present 3D models

Google SketchUp Pro 6 is software that you can use to create, share and present 3D models. SketchUp Pro provides extra functionality for people who need to export their work into CAD, rendering and other professional software applications. SketchUp Pro 6 also includes LayOut, a completely new program that lets you create complete presentations – paper and digital – from your SketchUp models. Discover how to use SketchUp Pro to make buildings for Google Earth. Find out more about plugins to extend the functionality of SketchUp Pro, as well as applications that are SketchUp compatible.

What makes SketchUp great?
Google SketchUp is a tool for creating, editing and sharing 3D models. The SketchUp "secret sauce" is a unique set of powerful tools that are designed to be easy to learn and use:
Edges and Faces: Thats all there is to it

Every SketchUp model is made up of just two things: edges and faces. Edges are straight lines, and faces are the 2D shapes that are created when several edges form a flat loop. For example, a rectangular face is bound by four edges that are connected together at right angles. To build models in SketchUp, you draw edges and faces using a few simple tools that you can learn in a small amount of time. It's as simple as that.
Push/Pull: Quickly go from 2D to 3D

Extrude any flat surface into a three-dimensional form with SketchUp's patented Push/Pull tool. Just click to start extruding, move your mouse, and click again to stop. You can Push/Pull a rectangle into a box. Or draw the outline of a staircase and Push/Pull it into 3D. Want to make a window? Push/Pull a hole through your wall. SketchUp is known for being easy to use, and Push/Pull is the reason why.
Accurate measurements: Work with precision

SketchUp is great for working fast and loose in 3D, but it's more than just a fancy electronic pencil. Because you're working on a computer, everything you create in SketchUp has a precise dimension. When you're ready, you can build models that are as accurate as you need them to be. If you want, you can print scaled views of your model, and if you have SketchUp Pro, you can even export your geometry into other programs like AutoCAD and 3ds MAX.
Follow Me: Create complex extrusions and lathed forms

You use SketchUp's innovative, do-everything Follow Me tool to create 3D forms by extruding 2D surfaces along predetermined paths. Model a bent pipe by extruding a circle along an L-shaped line. Create a bottle by drawing half of its outline, then using Follow Me to sweep it around a circle. You can even use Follow Me to round off (fillet) edges on things like handrails, furniture and electronic gadgets.
Paint Bucket: Apply colors and textures

You can use SketchUp's Paint Bucket tool to paint your model with materials like colors and textures. Better yet, SketchUp comes pre-loaded with a healthy library of photo-textures like brick, roofing and stone that you can use to make your model look as detailed as you like. You can find thousands more textures online, and if you're handy with a photo editing application like Photoshop, you can even make your own.
Groups and Components: Build smarter models

By "sticking together" parts of the geometry in your model to make Groups, you can create sub-objects that are easier to move, copy and hide. Components are a lot like Groups, but with a handy twist: copies of Components are related together, so changes you make to one are automatically reflected in all the others. Windows, doors, trees, chairs and millions of other things benefit from this behavior.
Shadows: Perform shade studies and add realism

SketchUp's powerful, real-time Shadow Engine lets you perform accurate shade studies on your models. Want to know how big to make the awning over your deck? Specify a geographic location using Google Earth, then use the simple Date and Time sliders to see how the sun will affect your design. Even if you're not using SketchUp for architecture, adding shadows is a great way to give your models more depth and realism.
Sections: See inside your models

You can use SketchUp's interactive Sections feature to temporarily cut away parts of your design, enabling you to look inside. You can use Sections to create orthographic views (like floorplans), to export geometry to CAD programs using SketchUp Pro, or just to get a better view of your model while you're working on it. Section Planes can be moved, rotated and even animated using SketchUp's Scenes feature.
Scenes: Save views and create animations

We created Scenes to enable you to easily save precise views of your model so you can come back to them later. Need to create an animation? Just create a few Scenes and click a button. SketchUp automatically "flies" from Scene to Scene, adding smooth transitions that you can fine-tune to get the results you need. You can also choose to export your animations as self-contained movies; SketchUp produces AVI files on Windows computers, and Quicktime MOVs on Macs.
Look Around and Walk: Explore your creations firsthand

SketchUp lets you get inside your model with a set of simple navigation tools designed to give you a first-person view. Click with Position Camera to "be standing" anywhere in your model. Use Look Around to turn your virtual head. Finally, switch to Walk to explore your creation on foot; you can even climb and descend stairs and ramps, just like you're playing a video game.
Dimensions and Labels: Add information to your designs

You can use the super-intuitive Dimension and Label tools to add dimensions, annotations and other glorious detail to your work. Once applied, SketchUp's dimensions are dynamic, meaning they automatically scale with your model. Labels are what we call "2.5D", meaning they remain visible no matter how you spin your model to look at it, but they always appear flat.
The Instructor: Catch on quickly

SketchUp's Instructor dialog box, which you can choose to activate at any time, provides context-sensitive help. Depending on what tool you're using, the Instructor displays step-by-step instructions, animations, useful modifier keys, and other handy tips for getting the most out of SketchUp.
Layers and the Outliner: Stay organized

When you're building a big, complicated model, things can get messy very quickly. SketchUp provides two useful ways to keep your geometry manageable: In addition to Layers, the SkechUp Outliner is a dialog box that displays a collapsible list view of all the Groups and Components in your model. You can use the Outliner to rearrange the nesting order of these elements, and to control their visibility without having to dig through your model to find them.
Google Earth: See your models in context

SketchUp and Google Earth are part of the same product family, meaning you can exchange information between them easily. Need a building site for your project? Import a scaled aerial photograph, including topography, directly from Google Earth to SketchUp by clicking one button. Want to see your SketchUp model in context in Google Earth? Click another button, and you can. Anyone can use SketchUp to build models which can be seen by anyone in Google Earth.
Sandbox tools: Work on terrain

SketchUp's Sandbox tools let you create, optimize and alter 3D terrain. You can generate a smooth landscape from a set of imported contour lines, add berms and valleys for runoff, and create a building pad and driveway.
3D Warehouse: Find models of almost anything you need

The Google 3D Warehouse is a huge, online repository of 3D models which you can search through when you need something. Why build something when you can download it for free? There are thousands of cars, trees, sofas, bridges, pomegranates and everything else under the sun, all contributed by people and manufacturers all over the world, and all available for you to use any way you see fit. If you create a model you'd like to share, you can upload it to the 3D Warehouse for everyone else to use.
Import DXF, DWG and 3DS: Get a headstart on your modeling

You can import DXF, DWG and 3DS files directly into your SketchUp models, which makes it very easy to start with drawings and even other 3D models. Have a floorplan of the space you need to model? Import it in, and start building right on top of it.
Import images: Paint walls with photos

With SketchUp, you can import image files like JPGs, TIFFs, PNGs and PDFs. You can use them by themselves (kind of like posters), but you can also stick them to surfaces to create photo-realistic models of buildings, package designs, and more.
Export TIFF, JPEG and PNG

SketchUp lets you export raster images up to 10,000 pixels square, so generating an image which you can send in an email, publish in a document, or project on a wall is as easy as choosing a few options and clicking Export. If you have LayOut (which is included with SketchUp Pro), you can create 2D documents with embedded SketchUp models, meaning you don't need to export images at all. Either way, you're all set when it comes to producing views of your model that anyone can use.
Export DXF and DWG: 2D line drawings and 3D models (Pro only)

Google SketchUp Pro allows you to export DXFs and DWGs, giving you an easy way to move plans, sections, elevations or even your whole model into your favorite CAD program. Exported geometry remains at 1:1 scale, and layers are preserved.
Export PDF and EPS: 2D vector images (Pro only)

With the Pro version of Google SketchUp, you can export views of your models in PDF and EPS format, allowing you to continue to work on them in vector editing programs like Illustrator and Freehand. For 2D images that need to be resolution-independent, nothing beats exporting to these formats.
Export 3DS, OBJ, XSI, FBX, VRML and DAE (Pro only)

If you're using Google SketchUp Pro, you can export your models to a number of useful 3D formats. Pros use a number of different tools, and these exporters allow SketchUp to join most professional workflows by offering interoperability with just about every popular 3D modeling application in existence.

New in Google SketchUp 6

Google SketchUp 6 includes a number of new features, including new ways to view your models, build models from photographs, create 3D text objects, performance enhancements, and more. The Pro version of Google SketchUp 6 also includes LayOut, a brand-new tool for creating professional 2D presentations from your SketchUp models.
Match a photo: Use photographs to build 3D models

SketchUp 6 includes a new photo-matching feature that you can use to build 3D models by tracing photographs. You can use multiple photos to build a model, and you can even use your photos to "paint" your model when you're done. SketchUp's photo-matching feature also lets you line up your view of an existing model to match the viewpoint of a photo. This is handy for creating a composite image of an unbuilt project in a photo of its site.
Styles: Fine-tune your models' appearance

The latest version of SketchUp includes Styles, an all-new way to control the way your SketchUp models look. Using Styles, you can change your background, edge and face colors. You can choose from a library of sketchy edge styles to make your lines look hand-drawn. You can use Watermarks (which are also new in SketchUp 6) to add your logo to your model views, or to add paper textures as backgrounds. Even better, Styles can be saved and shared across projects to give your organization's output a consistent appearance.
Watermarks: Add logos, backgrounds and more

SketchUp's new Watermarks feature lets you add 2D images to your SketchUp models – behind them, as underlays, or in front of them, as overlays. You might use a Watermark underlay to add a sky background, or to make it appear that your model is drawn on a textured surface like watercolor paper. Watermark overlays are an easy way for you to add your logo or other graphics to model views. You'll find Watermarks in the new Styles dialog box.
Sketchy Edge Effects: Make your models look hand-drawn

SketchUp's new Styles feature includes Sketchy Edge Effects, which you can use to make your model views look like you drew them by hand. A large built-in library of sketchy styles includes pencils, pens, markers, charcoal and more. If you've ever printed out a SketchUp model and traced over it by hand to make it look less "computerized", you'll appreciate the new Sketchy Edge Effects in SketchUp 6.
Fog: Add depth and visual interest to your work

In SketchUp 6, you can add the appearance of fog to your models. It's a great way to add depth and nuance, and it's easy to do: just click a button, choose a color, and move a couple of sliders to adjust how "foggy" you'd like your model view to look.
3D Text: Create 3D text for signage and more

We're proud to introduce our long-awaited 3D Text tool, which is new in SketchUp 6. Now you can create 3D objects from any text string you type, in any font you have on your computer. You can also control what kind of object SketchUp creates: simple vector outlines, filled 2D surfaces or fully-extruded 3D letters.
Other Improvements: Faster, easier to use, and more reliable

In addition to the new features we've added to Google SketchUp 6, we've made performance improvements that make SketchUp faster and more fun to use than ever. Check out the complete list.

LayOut: Create professional 2D presentations

Included with Google SketchUp Pro 6, LayOut (beta) is a powerful new tool you can use to create compelling, multi-page 2D presentations from your SketchUp models. It's a completely separate application that we developed to work hand-in-glove with SketchUp. LayOut saves you time and effort by eliminating much of the busywork involved in creating 2D presentations, both for print and digital presentation.
Update: Stop exporting images out of SketchUp

In LayOut, you can insert any number views of the same SketchUp model into your presentation. When you make changes to your model in SketchUp (and you know you will), there's no need to export another whole set of images – just click a single button in LayOut, and all your model views update automatically to reflect the changes. Easy.
Navigate: Orbit, pan and zoom your models right in LayOut

After you insert a SketchUp model view into your LayOut presentation, you're free to change your point of view at any time. Just double-click, then use your mouse to orbit, zoom and pan until you like what you see. Right-clicking brings up a menu of options for displaying your model with shadows, viewing specific Scenes (f you've set them up), turning on and off perspective, and more.
Scaled Views: See your models at any scale

You can choose to display SketchUp model views you've inserted into your LayOut document at any drawing scale you like. This lets you generate orthographic views like plans and elevations directly from your SketchUp model. And when your model changes, so do your views in LayOut.
Full Screen: Use LayOut to give digital presentations

With LayOut, you may never have to create a PowerPoint design presentation again. LayOut gives you the ability to display your presentations in a full-screen mode. You can use the arrow keys or your mouse to move from page to page, and even write notes directly on your pages while you're presenting. You can also spin your SketchUp model views around, and play animations that you've set up in SketchUp – all without leaving your LayOut presentation.
High-res printing and PDF export: Show your work

From LayOut, you can print your presentations at whatever resolution you need: high-res for small design packets, and lower for things like posters and boards. If you need to share your presentations digitally, LayOut even lets you export to PDF.
Text: You have full control

LayOut's powerful text-handling tools allow you to create callouts, title blocks, annotations and whole paragraphs of text. And of course, you have full control over the font, color and orientation of everything you create.
Callouts: LayOut makes labeling easier

LayOut includes a unique Label tool that you can use to create callouts quickly and easily. You can even design your own leader lines by combining settings for color, thickness and endcaps. Using the Label tool is as simple clicking to anchor an endpoint, clicking again to end the leader, and typing in the text for the label.
Sample: Duplicate graphic and text attributes quickly

Copying graphic styles from one object to another is easy in LayOut; just use the Sample tool. It even works on text objects, which makes changing the look of your presentations as quick and painless as possible.
Scrapbooks: Keep everything you need in one place

Scrapbooks are libraries of graphic elements like north arrows, drawing scales, logos and other symbols that are used frequently in your presentations. They appear in a handy dialog box, ready for you to use when you need them. LayOut comes with some starter Scrapbooks, but you're free to make your own and share them with the rest of your team.
Master Layers: Work smarter and get more professional results

In LayOut, you can work with two kinds of Layers: regular ones and Master Layers. Anything you put on a Master Layer automatically appears on every page of your presentation, except ones that you've set not to show content from Master Layers. This makes it easy to create multi-page presentations with things like logos, title blocks and other graphics that always appear in the same place on every page. It makes editing easier, too – make a change once, and it'll be reflected everywhere, instantly.
Vector graphics: Draw beautiful vector graphics

LayOut takes a kinder, gentler approach to drawing vector graphics – the tools are friendlier than others you may have tried to use. Draw shapes, color them, scale them, rotate them, stretch them and combine them together. You'll be surprised how easy it is to create beautiful vector graphics in LayOut.
Templates: Make life easier for yourself and your team

LayOut makes it easier for your team to create presentations that are consistent, no matter what project you're working on. Set up a Template with your organization's graphic identity – logo, colors, cover page, title block – and use it every time you need to start building a new presentation. You can even share your Templates with the rest of your team, making your workflow more efficient and your organization's work product more uniform and professional.

DOWNLOAD AVAILABLE FOR GOOGLE SKETCHUP PRO 6 INCLUDE KEYGEN

"A powerful, integrated 3D modeling, animation and rendering solution."
Award-winning Autodesk 'Maya' software is a powerful, integrated 3D modeling, animation and rendering solution that enables leaders in film and television, game development, design visualization, and education to stay ahead of the game. Here are some of its features:

Maya Nucleus Unified Simulation Framework
Maya nCloth
Python
Expanded Platform Support
mental ray Shaders
Transfer Polygon Attributes
mental ray Workflow you can free download Autodesk Maya 8.5 Personal Learnin now.

"A powerful, integrated 3D modeling, animation, and rendering application."
BSEditor, Autodesk 3ds Max software is a powerful, integrated 3D modeling, animation, and rendering application. Its accessible tools enable artists to quickly ramp up for production. 3ds Max software is used by design visualization professionals, game developers, film and video artists, multimedia designers (print and web), and 3D enthusiasts to achieve stunning results in less time.

(Note: 3ds Max is available for the Microsoft Windows Vista and XP Professional operating systems.)

3ds Max 2008 includes toolsets for
3d drawing incest toon virtual

Modeling and texturing
Animation
Visual effects
Rendering
Hair and fur
Cloth
Asset management and collaboration
plus
designcad 3d max

3ds Max API/SDK and MAXScripts
Tutorials and documentation you can free download 3ds Max 8 now.

Alibre Design Xpress is a rich and capable 3D solid modeler for creating mechanical parts, assemblies and 2D drawings - and is free. Certain more elegant features, like 3D sketching and part Booleans, can be found in the paid versions of the Alibre Design product family. Alibre Design Xpress equips the person needing basic 3D design capabilities.

Easy to Use and Learn

The genius of Alibre Design Xpress lies in its inherent ease-of-use. Those that are new to 3D will find the tutorials, help and user interface intuitive to learning how to build 3D designs. Those that have used 3D CAD previously will be delighted at the functionality and richness of features.

Built-in Training

Alibre Design Xpress has a rich set of integrated tutorials that you can use to learn the product quickly. These are the same tutorials included in paid versions of Alibre Design. Furthermore, you can opt to attend online training classes a-la-carte or with a subscription. Or you may order a product or training manual for self-guided study.

If you have trouble downloading, please try the mirror site below:

ftp.alibre.com

For reference, download the Alibre Design Installation Guide

freeCAD	A fully functional free Dynamic Simulation Software. Mechanisms are represented by connected or assembled joints of 3D solids with defined constraints, actuators, springs, dampers or forces. In addition to pure geometric and connection information, mass, moment of inertia, gravity, force and torque information are also modeled and used to predict the motion according to Newton's Laws. Animation using the simulated data produces realistic dynamic behaviour of the system under study. @1MB Created by: Aik-Siong Koh. Screenshot
Watt	A refreshing approach to Mechanism Design courtesy Heron Technologies, which rather than analyzing an existing mechanism, can be used to create mechanisms based on required co-ordinate movement, constraints on pivot locations, transmission coefficients, accelerations, dimensions etc. An excellent program that offers solutions to user specifications rather as against the old painful approach of trying to find out the right mechanism that works. Very easy to use friendly Windows interface, however the "Save" is crippled. @1.3MB Created by Heron Technologies Screen Shot
MBDyn	Command line free multi-body dynamics solver. A free graphical user interface can be download from OSEngineer Created by University Politecnico di Milano, Italy
Universal Mechanism	Simulation of kinematics and dynamics of planar and spatial mechanical systems. Mechanical systems are described by means of representing them as systems of rigid bodies connected by various kinematical pairs and force elements (multibody systems). Online animation of motion and plots of dynamical performances are available during simulation. There are lots of measurable dynamical performances of mechanical systems: linear and angular coordinates, velocities and accelerations, active forces and moments, reaction forces etc. Created by: Universal Mechanism Screen Shot

AMSES	A family of computer programs related to structural analysis and design. Special attention is given to the design according to European building codes, also known as Eurocode(s).
AutoCAD	AutoCAD and Autodesk trial versions.
AxCom	Free shaft dimensioning software: calculate strength, stress, strain, deflection, and safety factors.
CFD Freeware	CFD codes list - free software.
CFD Shareware	CFD codes list - shareware products
COSMOS	Trial versions of: design analysis and optimization software, simulation and kinematics software, computational fluid dynamics software, 3D-field simulator for low frequency electromagnetic/ electromechanical applications.
Delta Cad	2D CAD program, 45-day trial.
EdgeCAM	One year free NC Editor Pathtrace
Engineers.com	Spur Gear Analysis Analysis software and assorted mix.
FesaWin	Free FEA (only 50 nodes)
Fluid Power Net	A list for Dynamic Simulation Software for Fluid Power
GASP	Computational fluid dynamics(CFD) software. 60-day demo.
Gerotor Design Studio	Design, modelling and manufacture of gerotor pumping elements. 10 trials only
Get Psyched	Shareware that calculates Psychrometric properties. Displays the results on a graphical plot. 30 day trial
Gyles AeroDesign	Useful suite of programs to assist airplane modelers in improving the aerodynamic properties of their designs.
Jehar	Steam andWater flow in pipes
Maxsurf	CAD/CAM for the design, analysis and construction of marine vessels.
MNS/ADNR	Structural and acoutic vibration analysis. 30 day demo.
MSC.visualNastran 4D	Mechanical simulation software. Demo available.
Multiframe	Stuctural CAD software.
Online FEA	Free FEA software in Java which you can run online in your Webbrowser.
Pipe and Gas flow	Free pipe flow and Gas flow software.
RCCAD	RC CAD is an acronym for "Radio Control - Computer Aided Design". It is specially designed to help modelers to create airplanes. It supplies a real-time 3D visualization of the model you are designing.
RealCADD	2D Computer Assisted Drawing program. Demo version available.
SoftCAD.3D	3D architectural CAD program, 1 month free trial.
Solid modeling and 2D CAD	Solid modeling and 2D CAD system. 30 day trial.
Steam Properties	Shareware program for calculating Steam and Gas properties, flue gases etc
StlWork	A low cost 3D solid/surface tool path development system for CNC milling or routing (also known as CAM programming). 1-month trial version.
Student's QuickField	Freeware FEA program for electromechanical devices. It is a full-featured analysis program with a limited number of mesh nodes. For PC.
TabiCAD	TabiCAD imports tables from MS Office documents into AutoCAD 2000 and R14
Tecplot	CFD data visualization software.
Thermodynamics on-line help	Thermodynamics on-line help is a help file in MS Windows help format. Topics are: fuels, heat, energy, exergy, thermodynamics laws, heat engines, gas turbine, steam turbine, combustion, etc.
TrueGrid	Hexahedral Grid and Mesh Generation for Fluids and Structures.
Vibrationdata.com	Software for Vibration analysis, shock analysis, signal processing.
Working Model	Motion simulation and testing program. Demo version available.

Columbus	A very simple interface for viewing almost any CAD format. Can be used in a Networked Environment. Lots of features, and registration is absolutely FREE. @ 16MB. Created by Arup Inc
AutoVue	AutoVue is a visualization and collaboration Viewing and Markup software which can natively view over 200 different document formats including Pro/ENGINEER, AutoCAD, MicroStation, CADKEY, CATIA, Inventor, Mechanical Desktop, SolidWorks, SolidDesigner, Solid Edge & STEP. A JAVA thin-client version is available. A fully functional evaluation versions of all programs are available for download. However, it puts a watermark on your drawing. Created by Cimmetry Systems
iges2step	Allows viewing IGES and STEP files and translating between them.
VIEWPlot	Viewplot allows you to inspect various CAD formats, take measurements and manipulate data.Create high resolution PDF documentation within the graphical user interface or in batch mode. Supported Input formats: Gerber(X), DXF, Drill, Hpgl. Created by Roneda
VariCAD Viewer	Viewer to for VariCAD created drawings. Created by VariCAD
AutoDesk Viewer	To view and print DWF files. Created by AutoDesk
PS Exchange	Free powerful stand alone CAD translator program capable of translating from many popular CAD input formats to many output formats. Created by Delcam Plc.
Bentley	A CAD file viewing for DGN, DWG and DXF file formats. Created by Bentley
DevCAD	Freeware DXF, DXB, DWG converter. Created by DevCAD Team
Solidworks Viewer	eDrawings Viewer allows viewing of native AutoCAD� files (DWG and DXF) and native SolidWorks parts, assemblies, and drawings. Created by Solidworks Inc.

DesignWorkshop Lite	Build 3D models for home design, visualization of architecture, landscapes, exhibits, or any kind of spatial design with DesignWorkshop Lite, courtesy artifice Inc, you can also view and walk-through ready-made models created in 3DMF format, DXF, Design Workshop etc. Created by Artifice Inc
ArchT	Architectural software for IntelliCAD and AutoCAD. Created by Autodsys
AllyCAD	This is a free version that limits the size of the model file you can save. Suitable for civil, structural, architectural and surveying needs. Created by Knowledge Base Pty Ltd
Cambridge	Specifically designed to facilitate map creation, it has an interface for 3D digitizers and stereo plotters and a mask programable interface so that it can communicate directly with ANY 3D digitizer or stereo-plotter!. Screen-Shot Created by Westbrook Enterprise LLC
CYCAS	Architectural software for drafting and design in 2D & 3D. Rendering is provided by the freeware POV-Ray engine. The freeware version of their commercial product is restricted to using just one layer, printing to only A4 size, there may also be additional limits to the features offered. Screen-Shot Created by Verlag A.C.Frese For Windows & Linux
KREOnet	For laying out tiles & mosaics on floors & walls with texturing. Screen-Shot Created by Iris Fabbrica Marmi e Graniti For Windows
SketchUp	3D CAD from Google. Created by Google Inc.
Octree	The beta releases are free for now. It's a revolutionary idea in interface design that maximizes the screen space for drawing. Created by FCA GmbH and GbR HNS Platform - Unix & Windows (some limitations on Windows)
Envisioneer Express	Simple creation of floor plans, 3D models, and interior design concepts, it uses real world objects such as walls, doors, windows and stairs. Very easy to learn. Created by CadSoft Corp.

Cap Completely free simple & smart 2D CAD program.
Screen-Shot
Created by Michael Henderson

free2Design Completely free 2D CAD program.
Screen-Shot
Created by think3.

APM Graph LV 2D parametric program. The only restriction is an absence of database that contains drawings of Russian standard details and manufactures.
Created by APM R & D.

Draft IT Good 2D drafting program. Light version of their commerical product.
Created by CAD Logic

BRL CAD The U.S army has released a CAD system to open source, which is now being enhanced by the open source community. It runs on Windows, Linux, Mac & Solaris.

Desi III A free fully functional 2D CAD program. The "Save" is working. A very professional program, and fairly easy to use. Although listed under Architecture CAD software, it can also be used for general mechanical CAD work. Good explanations have been provided for using the software. @2.5MB
Created by Hugo Marein

A9CAD

General purpose 2D CAD program. Screen-Shot Created by A9 Tech Inc., Inc

bCAD	Software tool for computer drawing, 3D modelling and realistic visualisation for engineers, designers and architects. Created by ProPro Group, Inc

VectorEngineer A compact & efficient 2D CAD software, some features have been disabled in the free version, but nothing you can't live without.
Screen-Shot
Created by Duncan Aylwin

JustCAD 2D CAD software complete with all the required tools.
Screen-Shot
Created by Jon Hoke