open source high performance realtime 3D engine written and usable in C++ and also available for .NET languages. It is completely cross-platform, using D3D, OpenGL and its own software renderer.
The JOGL project hosts the development version of the Java™ Binding for the OpenGL® API, and is designed to provide hardware-supported 3D graphics to applications written in Java.
jME (jMonkey Engine) is a high performance scene graph based graphics API. Much of the inspiration for jME comes from David Eberly's book 3D Game Engine Design.jME was built to fulfill the lack of full featured graphics engines written in Java. Using a abstraction layer, it allows any rendering system to be plugged in. Currently, LWJGL is supported with plans for JOGL support in the near future.jME is completely open source under the BSD license. You are free to use jME in anyway you see fit, hobby or commercial. All we ask is a little footnote (donations are nice too.)
Espresso3D is a high performance real-time 3D engine for the Java(tm) programming language. E3D is not just a scene graph. It aims to be a complete solution for your application with OpenGL rendering, OpenAL audio, collision detection, input, and rendering support.
Espresso3D began as a free for non-commercial use library in October 2004. As of April 8, 2008 Espresso3D is available under the open source LGPL license.