Hedgewars, it's a Blast! This is the funniest and most addictive game you'll ever play - hilarious fun that you can enjoy anywhere, anytime. Hedgewars is a turn based strategy game but the real buzz is from watching the devastation caused by those pesky hedgehogs with those fantastic weapons - sneaky little blighters with a bad attitude!...

StepMania is a free dance and rhythm game featuring 3D graphics, dance pad support, and a step editor. Supports Windows, Linux, Mac OS X, and Xbox.

KStars is a graphical desktop planetarium for KDE. It provides an accurate simulation of the night sky, as seen from any location on Earth, on any date. It has a host of tools for every astronomer and astronomy enthusiast!

Multiplatform C++ Standard Library (STL implementation). Many compilers and operational environments supported. Standard (ISO/IEC 14882) compliance. Maximum efficiency. Exception and thread safety. Debug mode.

Tundra is a scriptable 3D internet application development platform. It is aimed primarily for application developers, as a platform for creating networked 3D worlds with customized content.

Note: tracks only the core C++ part of Tundra and following parts are ingored: demo scenes (bin/scenes/), JavaScript (bin/jsmodules/) code examples, and C++ plugins AssetInterestPlugin, MumblePlugin, OpenAssetImport, SceneWidgetComponents....

mC2 is a total rewrite of musikCube.,

act of a flowing; a continuous moving on or passing by, as of a flowing stream; a continuous succession of changes
fluxus is a livecoding environment for graphics, which can generate animation from sound input, using a 3D rendering engine

This is a simple templatized C++ library for parsing command line arguments. The library provides a simple, flexible object-oriented interface to the command line that automates argument parsing, USAGE creation and type casting.

Clutter is an open source (LGPLv2.1+) software library for creating fast, compelling, portable, and dynamic graphical user interfaces. It is a core part of MeeGo, and is supported by the open source community. Its development is sponsored by Intel.

Clutter uses OpenGL for rendering (and optionally OpenGL|ES for use on mobile and embedded platforms), but wraps an easy to use, efficient, flexible API around GL's complexity....

OpenArena is an open-source content package for Quake III Arena licensed under the GPL, effectively creating a free stand-alone game. You do not need Quake III Arena to play this game.

Bots were added starting in 0.6.0. They will spout taunts and everything!...