Going all-in with PokerTH

According to Wikipedia, Texas Hold'em is "the most popular poker variant played in casinos in the United States." With the GPL-licensed multiplatform (Linux, Windows, Mac OS X) PokerTH, you can play Texas Hold'em against up to six computer opponents on your desktop, or you can join an Internet server and play against other real players.

If PokerTH is not available as a package for your distro, you can download either the source or executable version of game from the project page on SourceForge.net. While still pre-1.0, PokerTH is far enough along in development to be included as a standard offering in openSUSE, Ubuntu 7.10, and other distros.