You can use Cardhouse to play card games online. Currently there are 14 different games supported, these are: Whist, Bid Whist, Color Whist, Solo Whist, Sergeant Major, Five Card Draw, Texas Hold 'em, Tien Len, Svoi Kozyri, Court Piece, Schwimmen, Old Maid, Highest Card and War. For the rules of these games you can go to www.pagat.com.
For the moment I don't have any hosting for the dedicated server, so if you want to play with some friends one of you will need to run the server program. If you have a server and you are willing to run my server app on it please contact me at firstname.lastname@example.org.
Cardhouse is free or open source software licensed under the GNU General Public License.