Wargameroom is an online game free system.
Games are played in real-time. Rules are enforced automatically, which makes the games very fast and easy to play.
Players join the chat room to find opponents. Each player must have Java and the most recent game file on their computer. Downloads of both can be found from links from the site's front page. One player hosts the game, the other connects for peer to peer play.
There is no fee, but players are encouraged to make a regular Paypal donation to the site's creator and programmer.
In addition, for most of the games there is league play.