GEM (Graphics Environment for Multimedia) is a library to be used with Miller Puckette's Max-like realtime-computermusic-software "Pure Data" (Pd), which allows to draw and control openGL- and pixel-graphics (like video) in realtime from within Pd.
FOX is an Extensible C++ Class Library for Multi-Platform GUI development. Platforms supported include Linux, Windows NT/9x/2K, and UNIX/X11 workstations (IRIX, Solaris, HP-UX, Tru64, AIX, FreeBSD, and others).
ProtoMol is an object-oriented component based framework for molecular dynamics simulations.
2D/3D Scene Graph rendering engine for Linux/Unix/Win32 layered atop OpenGL. Supports stereoscopy, volume rendering, 2D/3D texture mapping, picking, LOD and view-dependent operations, cross-platform text, constant-rate rendering and image-based data.
A C and C++ Library + a compiler to create Adobe Flash SWF movies up to version 9 (v1.8.1). Supports nearly all the tags, includes an ActionScript compiler. Detailed docs and other tools: convert fonts to Flash, decompile Flash, jpg2swf. LASTEST IS 1.8.4
High quality volume graphics on consumer PC hardware. This GPL project is a graphics application for the visualization of 3D volume data on uniform rectilinear grid, as they arise from tomographic measurement or numerical simulation in computational scie
Clawlib is or intends to be a cross platform C++ library
LittleFarm renders RenderMan .rib-Files over the network with some widely used renderers. It runs on irix, linux and win32.
SOAP module for Apache. Supports C++ server side components (classes) as well as other languages.
Terrain Voyager Engine is an OpenGL accelerated, multi-platform (Win32, Linux, IRIX) landscape engine. One of the goal of it is to make a small FPS game.
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Yet Another Homemade Game Engine (yahge) is what the name says a free open source 3D Game Engine geared towards development of 3D First Person Shooters. Major goals are to provide a Rapid Prototyping System for Game Ideas or to make Game Demos for Resume