Witz is an open source Chess engine that was originally designed by Pradu Kannan(duu@users.sourceforge.net) and hosted on sourceforge.net.
This modification to the engine, made by Gil Knyazhansky and Merav Zanany from Tel Aviv university, introduces a mutlithreaded calculation environment for the Alpha Beta algorithm mainly used by the engine.
https://code.google.com/p/mwitz/