List of browser based online multiplayer games
Here is the list of browser based online multiplayer games.
These games does not need you to download anything. But would need a internet connection.
There are two types turn based and realtime. In turn based, you can play your moves leave the site and then come back on a different time and play again.
Cyber Nations - I have Played it and found it as a ok game
Domain of Heroes
Fallen Empire: Legions
kdice - I have Played it and its a nice game
Kingdom of Loathing
Legends of Zork
Monopoly City Streets
Terra Est Quaestuosa