#1. freeCAD offered by AR-CAd at http://www.ar-cad.com
freeCAD is a basic 3D CAD with advanced motion simulation capabilities. It is suitable for anyone interested in learning 3d CAD and motion simulation for free before using more sophisticated packages. Educators, students and new engineers will find it ideal for the teaching and learning of geometry, kinematics, dynamics, vibrations, mechanisms, linkages, cams, machine design and physics. The program runs on windows, linux PC, macintosh PPC and other Unix's. Assembly data are unchanged across platform. It is a freeware and can be distributed freely subject to the disclaimer.
#2. FelixCAD LT Second Edition by GiveMePower GmbH at http://www.givemepower.de
Create Professional 2D Designs absolutely FREE with FelixCAD LT, brief descriptions as below:-
Powerful CAD for Everyone
- Don't miss out! Be one of the first 1 million users to register your FREE FelixCAD LT
Use Your Existing Designs
- Directly open billions of existing designs saved in industry standard DWG® and DXF®. Compare with industry leader AutoCAD®.
Sync FREE With PowerCAD CE
- FelixCAD LT and PowerCAD are the perfect desktop companions for mobile PowerCAD CE, & etc.
#3. CADstd by Apperson & Daughters Present at http://www.cadstd.com/
CadStd is a general purpose, easy to learn CAD/drafting program for creating professional quality mechanical designs, house plans, blueprints, schematics and charts utilizing ANSI drawing standards. The Lite version is free and can read any drawing created by the Pro version. CadStd Lite can export files as DXF so you can share your drawings with friends who have other CAD programs like Autocad.
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