j2chess includes an opening book of 15,000 games and can play games in three different modes; casual, blitz and blitz Fisher. j2chess can read ".pgn" library files and therefore can be used as a ".pgn" browser as well.
As a matter of fact, j2chess is a pure hobby project and its development progress is fairly slow! But who minds? ;-) I just hope I'll give you the opportunity to have fun playing chess. You can also help me to improve j2chess by sending me your feedback via email. j2chess is a freeware but if you enjoy it you can always say "Thank you" by making a donation.