by Mana Games Tennis Elbow 2004 is the best 2D tennis game for PC, with fun, realistic gameplay.
You can play on 5 grounds : clay, grass, hard, indoor, synthetic.
In world tour, there're 95 tournaments, and the Davis Cup, to play against 250 players.
by RS Software Lab NetChess is a chess program that allows
you to play with opponent over internet/intranet
or on the local computer. Features include chat, load/save game,chess-clock, move logging,
coordinate system.