MV3D is an open source virtual world simulation framework written in Python. It was designed with scalability in mind and aims to be able to distribute a world across as many servers as needed while dynamically balancing the load.
Condottieri is a web based, multiplayer game, inspired in Avalon Hill's classic "Machiavelli". The game is set in Renaissance Italy but it's easily adaptable to other scenarios and eras as long as the rules are like the ones in "Machiavelli".