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PDSYMS DWG Symbols Library
PDSYMS v2.0 is an Architectural/Interiors DWG-FORMAT Symbols Library Add-on for all CADD packages running on all platforms and Operating Systems.
Batch Convert DWG and DXF to GIF/JPG/PNG/TIFF Quickly and Easily without the need of AutoCAD.
dwgPlotX is an AutoCAD batch plot tool which bears a simple windows explorer style inteface to select files. In addition to plotting/, it can also bulk replace strings/texts in dwg files or export them to many formats.
Blender is the first and only fully integrated 3D graphics creation suite allowing modeling, animation, rendering, post-production, realtime interactive 3D and game creation and playback with cross-platform compatibility - all in one tidy, easily
This 3D graphics editing tool can be easily used for molecule creation. Falco Molecule is a 3D graphics editor for molecule creating. You can use this OpenGL editor in order to generate chemical molecules
progeCAD Smart! is free forpersonal use. DWG DXF PDF read write. Similar icons, commands and interface. Raster image embedding, IntelliCAD AutoLISP interpreter