Strong chess program for the Android platform
DroidFish is a port of the very strong stockfish chess engine to the Android platform, combined with a feature-rich GUI.
DroidFish should work on all Android versions. On Android 2.2 and later it is also possible to install the program on an external SD card.
Downloads
Opening books
The program supports the polyglot opening book format. I have found good opening books at RWBC web site, but you can of course use any polyglot books you want.
The program also supports the CTG opening book format.
http://web.comhem.se/petero2home/droidfish/index.html