Molecule for Macintosh Molecule for Macintosh: Structure editor. Especially suited for computational chemistry, supports several file formats and operations such as animations and optimizations. License fee required. (Structural) http://www.ccc.uni-erlangen.de/hommes/molecule/
Mol2Mol Mol2Mol: Molecule file manipulation and conversion shareware for Windows. Works with about 40 file formats. Screenshots, downloads, and purchasing information. (Structural) http://web.interware.hu/frenzy/mol2mol/index.html
MOLGEN MOLGEN: Program for the automatic generation of constitutional isomers and combinatorial libraries, for Unix/Linux and WinNT/95. Free demo available. (Structural) http://www.mathe2.uni-bayreuth.de/molgen4/
Marvin Marvin: Java applets for the web developer who builds chemical internet/intranet sites. The package contains an applet for editing and visualizing molecules on a web page and one for viewing molecules on a web page. (Structural) http://www.chemaxon.com/marvin/