Chemical structures drawing software

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Avogadro 3D structure
MarvinSketch 2D structures
  • Avogadro free 3D cross-platform chemical drawing software
Comment: I had some stability issues w v1.0.3 on OS X but found the software very useful overall. The peptide inserter is a very nice feature. No 2D drawing.
  • MarvinSketch free*, mostly 2D chemical drawing software; *educational, also commercial version (Win/Unix/Mac)
Comment: very clean 2D drawing software; structure validation is very useful; specialized features like stereochemistry, complexes, radical, isotopes..; free academic and paid version; v5.10 as of 7/2012.
ISIS/Draw no longer available
successor Symyx, already itself superceded by Accelrys Draw
  • XDrawChem free 2D drawing software (Win/Unix/Mac)
Comment: simple yet neat little online tool to draw chemical structures