aka ogre v2 - scene-oriented, flexible 3D C++ engine
Interactive 3D Layout Viewer for GDSII
LDraw™ editor for LEGO® style digital building instructions.
For building cross-platform 3D geospatial apps in Java
Cross Platform Professional Procedural Terrain Generation & Texturing
Open Source graphic tool and alternative to Insane Bump
PixelLight is a cross-platform application framework
Game engine supporting many 3D/2D formats and graphic effects