Scrabulous: Free online multiplayer scrabble
Scrabulous > Live Game, Email Game, Blitz (Quick), Solitaire (Solo/PC)
Travian: Tediously slow getting started, but very rewarding multiplayer civilization/strategy simulation.
Travian > Travian – Server 1
The Continuum: Very well put-together turn based strategy game, which is flash based and runs very smoothly.
The Continuum > Login – Launch Game
Monster’s Den: A Great little single-player RPG (Don’t delete your cookies though, or you lose your saved game like me!)
Monster’s Den
Kongregate: One of the best free online game portals I’ve found.
Kongregate > Kongai
Look Promising:
http://www.battledawn.com/ – Space Strategy
Drasil – Fantasy MMORPG
Eclipse – RPG Maker
Lords – Strategic MMorpg
World of Dungeons – Fantasy MMORPG
Dransik – Old School MORPG
Sanctum – Card Based Strategy
Savage – Cool mix of Strategy and 1st Person Shooter
Aranock – MMORPG
Empiriana– PwP MMORPG
Flash Based Action
ToonCrisis – Crazy but fun shootemup