eRegime describes itself as a "forum for forum games". It was created in February 2012 by a user named Ismail. Each forum game is run by a GM (Game Master) and what makes the forum unique is that users decide what games they would like to run. Anyone willing to GM a game is given moderator powers over whatever forum areas they want created to run their game.
Most of the games are geopolitical or historical in nature, although a few have covered fantasy worlds. A popular forum game is called "Balance of Power" which is loosely based off of a video game by the same name created by Chris Crawford.
eRegime also hosted the first iteration of the forum for Bloc, a popular webgame.
http://eregime.org/index.php