IGLU is a Java class library designed to facilitate sharing of code among Artificial Intelligence/Information Retrieval researchers to illustrate how various problems can be solved in Java. It is developed and maintained by the IGLU Research Group.
Expandable multi-player online spacegame with influences of MUD & IRC.
SimpleORM provides provides a very simple and easy way to implement object/relational mapping on top of JDBC atlow cost and low overhead. Not even an XML file to configure! It has clean database semantics and is very scalable. See http://berglas.org/simpleorm/index.html.
Yet Another Homemade Game Engine (yahge) is what the name says a free open source 3D Game Engine geared towards development of 3D First Person Shooters. Major goals are to provide a Rapid Prototyping System for Game Ideas or to make Game Demos for Resume