Glaurung is a strong free chess program for the Apple iPhone. It's powered by the Stockfish chess engine by Marco Costalba, Joona Kiiski and Tord Romstad, one of the strongest free chess programs.

Glaurung can be downloaded from Apple's App Store. On this web page, you'll find the Glaurung source code, and binaries and source for the companion program GlaurungServer, which allows you to run the chess engine remotely on your home computer.