JSettlers2 is a web-based version of the board game Settlers of Catan written in Java. This client-server system supports multiple simultaneous games between people and/or AI bots. Originally written by Robert S Thomas as an AI dissertation (http://sourceforge.net/projects/jsettlers).
The active source code is hosted at https://github.com/jdmonin/JSettlers2 including full history; the sourceforge CVS is historical up to 2012-09-28.
NetRisk GWT allows anyone to play a full game of Risk with up to 8 players from any Javascript enabled browser. Bases on the code of NetRisk 2.0 (https://sourceforge.net/projects/netrisk/) Demo: http://www.netrisk-online.de/