Friendly Object-Oriented Game Library , 2D Java Game Engine based on Slick2D and LWJGL. This library was designed for students and primer Java programmer. Scene and Actor, Sprite Manager, Sound,Music, Collision Manager FooGameLib 1.0 License - GNU General Public License (GPL)
Orx is a portable, lightweight, plugin-based, data-driven and extremely easy to use 2D-oriented game engine. As orx is data driven, it allows users to create games with a small number of lines of code and reduces drastically the development time.
Hopp is a lightweight 2D/3D game engine/framework which is intended to be simple and at the same time easy to use. Hopp game engine/framework 1.0 License - GNU Library or Lesser General Public License (LGPL)
2D/3D Game Engine for use in game creation as well as easy RAD. 4E5 Game Engine 1.0 License - Academic Free License (AFL)
Macchiato Doppio is a Java game engine emphasizing cross-platform interoperability, and 2D and 3D support. Efforts are currently underway to re-engineer previous code to a new structure. Macchiato Doppio 1.0 License - GNU General Public License version 3.0 (GPLv3)
Jiboia is both a Generic Java Game Engine/API as well as a Game created to demonstrate this engine. The engine provides abstract call-back integration of pluggable Graphics Processing (2D or 3D), I/O, Network and Sound Modules. Jiboia 1.0 License - GNU General Public License (GPL)
Rails is a Java game engine intended to play any of the 18xx series of turn-based board games For 3-6 players and set in the 19th century, these games allow players to step into the shoes of the robber barons and railroad tycoons of the time period..
Open Source Java game engine based on Forgotten Realm's Unlimited Adventures Java Infinite Adventures 1.0 License - Adaptive Public License
KOFFE is a 2D fighting game engine compatible with KOF'91. Written in Object Pascal, it's very configurable: it's possible to change all character definitions, backgrounds, sounds and graphics. KOF'91 Fighting Engine 1.0 License - zlib/libpng License
The Quebra Engine is a simplistic, cross platform 2D/3D game engine being created using C under the GCC compiler. It makes use of the GLFW library for platform abstraction and is expandable through the usage of text based scripts. Quebra Engine 1.0 License - GNU General Public License (GPL)