Open Babel

OpenBabel
FreeOpen Babel: The Universal Chemical Data Toolbox
Windows
OpenBabel for Linux
FreeOpenBabel for Linux: Comprehensive Chemical Reference Software
Linux
OpenBabel for openSUSE (32-bit)
FreeOpenBabel: Versatile Reference Software for Chemistry
Linux
OpenBabel for Fedora (64-bit)
FreeOpenBabel for Fedora: A Comprehensive Reference Tool
Linux