Rich HTML UI engine for UE4
A Flash Molehill (Stage3D) GPU accelerated 2D game engine
A game engine written in the D programming language
Plugin based multi-purpose dev tool.
PHIGS (Programmer's Hierarchical Interactive Graphics System)
Graph algorithms interpreter, IDE, debugger, 3D visualizations.
An editor for Java 3D scenes
The main task is an independent API for KDE and Qt
press ctrl button with shelf button to toggle imageplane
1st 3D game engine built in C# for .NET, Visual3D Engine's predecessor