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Inkscape
An Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format. Inkscape supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more.
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