Magic Another Game Engine
Skript is a Bukkit plugin which allows server admins
Java/JavaFX/Kotlin Game Library (Engine)
A companion for your LOTRO activities
Europa Universalis 4 save game editor
Arianne is an engine to develop multiplayer online games like Stendhal
Full featured MUD server with all the trimmings.
A simple cross-platform game engine for creating old-school 2D games
Fast-paced side-scrolling space shooter
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
Android apps.
8-bit Graphical API for Java
Android OpenGL Game Engine
SJCE - free portable cross-platform graphical chess game, 100% Java.
Auto Presser for Games
A tiny game engine to create arcade style 2D games.
Build Cross-platform Applications
a rpg that hopefully, with enough support, will become a online game.