SwiftShader is a high-performance CPU-based implementation
aka ogre v2 - scene-oriented, flexible 3D C++ engine
ArrayFire, a general purpose GPU library
Hewlett-Packard's Linux imaging and printing software
Open Source Solid Modeling CAD
xBRZ: "Scale by rules" - high quality image upscaling filter by Zenju
Window hooker to run fullscreen programs in window and much more...
FlightGear Flight Simulator: free open-source multiplatform flight sim
CGRU: Afanasy render farm manager and RULES project tracker.
DirectX 8 to OpenGL wrapper for legacy apps and portability
Design graphics for LED-based electronics projects
Display, convert, and edit raster image and vector image files
Opensource Created Custom Viewers For Virtual Worlds like SecondLife.
crossplatform multithreaded object-oriented render and audio engine
Realtime raytracer using SIMD on ARM, MIPS, PPC and x86
LDraw™ editor for LEGO® style digital building instructions.
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+
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
A lightweight, cross-platform image manager