SwiftShader is a high-performance CPU-based implementation
A layer built on top of the Insight Toolkit (ITK)
Productive, portable, and performant GPU programming in Python
aka ogre v2 - scene-oriented, flexible 3D C++ engine
ArrayFire, a general purpose GPU library
Hewlett-Packard's Linux imaging and printing software
xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju
Window hooker to run fullscreen programs in window and much more...
Open Source Solid Modeling CAD
FlightGear Flight Simulator: free open-source multiplatform flight sim
Display, convert, and edit raster image and vector image files
Design graphics for LED-based electronics projects
Software Facil, Vida Facil
LDraw™ editor for LEGO® style digital building instructions.
crossplatform multithreaded object-oriented render and audio engine
Realtime raytracer using SIMD on ARM, MIPS, PPC and x86
3D Without Boundaries
Scanning Probe Microscopy Controller and Data Visualization Software
Cross Platform Professional Procedural Terrain Generation & Texturing
Vivid is a modern C++ 3D engine using OpenGL4+