Software Development Lohninger (Popularity: ): This site offers software and programming components for Delphi and C++Builder covering mathematics, statistics, scientific graphing, and chemistry. Open Babel (Popularity: ): Open-source C++ library for molecule file conversion and pattern matching. PerlMol (Popularity: ): Free Perl modules for molecular chemistry. Tutorial, reference manual, downloads and mailing list. Frowns (Popularity: ): Free chemoinformatics toolkit geared toward rapid development of chemistry related algorithms. Written in Python with a small portion written in C++. The Octet Project (Popularity: ): Open-source, object oriented cheminformatics framework written in Java.