No specific info about version 2.3. Please visit the main page of Stockfish on Mac Informer.
Test your chess playing skills directly from your Mac.
Allows not only playing but also maintaining a database and analyzing games.
Snood Swap is a nice game in which you swap adjacent snoods.
Sigma Chess is a freeware, master strength Macintosh chess program for Mac OS X.
Glaurung is a strong free chess program for the Apple iPhone.