Nakshatra is a variant chess engine originally built to play suicide chess on FICS. Nakshatra can technically play normal chess as well but little to no effort has been expended towards making it a strong normal chess player. One of my initial goals was to support many chess variants so I believe the code is well organized for that purpose at least, though I never actually got around to adding more variants :)
Click here for latest FICS stats of nakshatra.
Once upon a time, I (sparingly) maintained a companion blog.
NOTE: As of late 2016, suicide chess is weakly solved. White can force a win with 1. e3.