Blender:Cross-platform 3D graphics creation suite for modeling, animation, rendering, post-production, realtime interactive 3D, game creation and playback
3D-Desktop: GNOME Linux OpenGL program for switching virtual desktops in a seamless 3-dimensional manner.
Cellumat3D: Open source tool for simulating and exploring cellular automata in 3D space
DSVideoLib - DirectShow Video Processing Library: Free software library for device-independent access video images under Microsoft Windows.
DXF to OpenGL: An OpenGL program, with source code included, that displays DXF files.
Image Restoration and inpainting: MinGW, OpenGL, Visual C++ and Java image processing project about enhancing, denoising, restoring and detecting/removing parts of images/pictures.
Jahshaka - Realtime Effects: Video and film composting and special FX system that uses OpenGL hardware rendering to give operators near real time interactivity. The system is cross platform, and includes full CG, paint and image processing modules.
OpenUniverse: Free space simulator. Currently focusses on the Solar System and lets you visit all of its planets, major moons and a vast collection of smaller bodies in realtime 3D with OpenGL.
PPE: The Pretty Poly Editor (PPE), is a free and open source 3D Modeller. (GNU GPL)
Really Slick Screensavers GLX Port: Port of OpenGL screensavers that were originally written for Windows to GLX. It is intended for use with an existing screensaver daemon like xscreensaver.
Stellarium: Free software for Windows and Linux. It produces photo-realistic skies in real time with openGL.
Terraform: Free and open source interactive height field (or fractal) terrain generation and manipulation program. OpenGL is used for rendering and for displaying the height field (or fractal) terrain. (GNU GPL)