OpenBabel 1.99r1

Put simply, Open Babel is a free, open-source version of the Babel chemistry file translation program.
OpenBabel is a project designed to pick up where Babel left off, as a cross-platform program and library designed to interconvert between many file formats used in molecular modeling and computational chemistry.

Open Babel includes two components, a command-line utility and a C++ library.
The command-line utility is intended to be used as a replacement for the original babel program, to translate between various chemical file formats.
The C++ library includes all of the file-translation code as well as a wide variety of utilities to foster development of other open source chemistry software.