Open Source Geospatial Foundation
MapGuide Open Source is a platform for developing web mapping applications.
A comprehensive open-source tool to create your own 2-D animated games.
Falling Block Game 2 is a puzzle game a la Tetris.
Open Dungeons Community
OpenDungeons is an open source, real time strategy game.
Risk - Risk Board Game
Java Risk is excellent Free Risk Game Software.
Set up and manage bus and train routes in a transport simulation game.
NullpoMino is an open-source action puzzle game that works on the Java platform.
Open Game Panel
Open Game Panel is an open-source web based Game server control panel.
JSmooth is a neat, open source Java Executable Wrapper.
An open source Java XML editor with a configurable GUI.
Open source, Java EE 5 based, Enterprise Content Management (ECM) platform.
jBubbleBreaker is an (extensible) open source java clone of the BubbleBreaker.
Sheetster is an open source, Java alternative to Google Spreadsheets and Office.
jphonelite is an open source Java SIP VoIP audio and video SoftPhone.
Notes Master is a free and open source Java application.
jrouter is an open source Java method processing router.