Open Babel is a community-driven scientific project including both cross-platform programs and a developer library designed to support molecular modeling, chemistry, and many related areas, including interconversion of file formats and data.
License: GNU General Public License (GPL)
Changes:
Highlights include improved force fields and coordinate generation, conformer searching, enhanced plugins including molecular descriptors, filters, and command-line transformations. Many formats are improved or added, including CIF, mmCIF, Gaussian cube, PQR, OpenDX cubes, and more. An improved developer API and scripting support and many, many bugfixes are also included.