Colt provides a set of Open Source Libraries for High Performance Scientific and Technical Computing in Java http://acs.lbl.gov/~hoschek/colt/ This project starteda as a port of the Colt core library to C#, but contains additional features.
The OpenGDK project has been renamed to what it should be. It's been moved to https://sourceforge.net/projects/opengdk/ I apologize for the inconvenience and confusing it caused.
OpenGDK is short for Open Game Development Kit. It's supposed to be a plug-in BASED (it's different from OGRE. OGRE is plug-in friendly), cross-platform, open source, general purpose (2D, 3D, client, server, editor), game development kit.
Simple, Fast, Advanced... ZintoriOS. Made in Wellington, New Zealand
A Backend Server Software Development Kit and Creation Suite