Software and programming components for Delphi and C++Builder covering mathematics, statistics, scientific graphing, and chemistry.

Open source Java computational chemistry package which supports chemical structure drawing and the graphical layout of 2D chemical structures.

Open-source C++ library for molecule file conversion and pattern matching.

Free library for molecular modeling applications. Written in Python, with a few portions in C. Downloads, examples, documentation, and wiki.

A distributed client/server system for the computation, management, analysis and visualization of chemical information of any type. Tool collection for several Unix flavors; some of the tools are distributed freely in precompiled form.

Free Perl modules for molecular chemistry. Tutorial, reference manual, downloads and mailing list.

A Java based development tool for building portable chemical information systems.

Free Perl module for converting PDB files to VRML for 3D visualization.

Free C++ library for converting Protein Data Bank (PDB) files to Virtual Reality Modeling Language (VRML) worlds.

Free chemoinformatics toolkit geared toward rapid development of chemistry related algorithms. Written in Python with a small portion written in C++.