Open Babel is a chemical toolbox designed to speak the many languages of chemical data. It's an open, collaborative project allowing anyone to search, convert, analyze, or store data from molecular modeling, chemistry, biochemistry, or related areas.

Put simply, Open Babel is a free, open-source version of the Babel chemistry file translation program. Open Babel 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, computational chemistry, and many related areas.

Open Babel Features:
1. Ready-to-use programs, and complete programmer's toolkit
2. Read, write and convert over 90 chemical file formats
3. Filter and search molecular files using SMARTS and other methods
4. Supports molecular modeling, cheminformatics, bioinformatics
5. Organic chemistry, inorganic chemistry, solid-state materials, nuclear chemistry

The license of this software is Free, you can free download and free use this calculator software.