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Molby is a software for building molecular models on the graphic screen. It works on Mac OS X and Windows. It can import and export files for other computational chemistry softwares such as GAMESS and Gaussian. It can also edit molecules by scripts running on the built-in Ruby interpreter. Official Home Page: http://molby.sourceforge.jp/index-en.html
You can download file releases of Molby - A Molecular Modeling Software project from List of release files
System RequirementsOperating System: MacOSX, Windows XP
List of release files