From Teaching Open Source

Freecell Solver is an open-source (MIT/X11 Licensed) and portable C library for automatically solving several types of single-player card games. Freecell Solver sports many features, a good speed, and practically infinite configurability, and has been integrated into several larger open-source and proprietary products.

[edit] How to help?

Contact Shlomi Fish and express your interest in the project. Follow the instructions on the website for checking out the source code from its Subversion repository, look at the TODO list, learn the code and try to get your feet wet. We announce new developments as we come upon them on the mailing list so you should subscribe.