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The Chemistry Development Kit (CDK) is a scientific, LGPL-ed library for bio- and cheminformatics and computational chemistry written in Java.
The main home page of the CDK is now at: http://cdk.github.io
QSAR is a project that aims to build a GUI that enables people to build quantitative structure activity (or property) relationship models. It will use parts of CDK (cdk.sf.net), JOELib (joelib.sf.net), R (www.r-project.org) and other projects.
SDFCherry is a command-line program that searches for textual matches in molecular structure files of SDF format and outputs the structures that match. Optionally adds a data field to the matched structures, e.g., biological activity. Useful for QSAR.