aBridge: Free cross-platform online bridge game with support for Windows and UNIX.
Bridge Club Live: Provides live internet play of contract and rubber bridge using Acol or SAYC systems, and has free guest memberships.
Bridge Doctor: Interactive contract bridge lessons and club. Offers a competition ladder.
BridgeBase Online: Offers play and practice areas. Presentation of live vugraph of major events. Free.
e-bridge: Offers many tournaments every day, lessons, articles. Hosts the ACBL official online club. Awards masterpoints for elegible North American players.
Floater: Matchpoint pairs and IMP pairs online bridge. Provides FAQs, links, download for Windows, Mac OS, and UNIX.
OKbridge: Offers social rooms and tournament play.
Paragon Bridge: Windows 95/98/2000/NT/XP. Software to play against the computer or online.
StepBridge Australia: Free online playing. Windows.
Swan Games: Provides bridge software and online support.
Topbridge: Offers individual games, tournaments, rankings, and links.