GLTriad (Win32, uses OpenGL)
OpenGL Triple Triad, which uses the original Final Fantasy VIII PSX game assets to run straight off the CD (meaning the distribution is entirely legal and includes no assets at all ^^). Supports online play against others via TCP/IP. All the rules from Triple Triad are there and you can toggle them on and off as you please before you start a game (the host decides the rules for multiplayer).
Note: The game requires disk 1 of Final Fantasy VIII for PS1 to play!
Play your friends online! (you must know their ip address)
Choose your own rules for each game
Change the screen resolution
Change the background
Check out this file and others at http://www.telefragged.com/thefatal/