Arianne is an engine to develop multiplayer online games like Stendhal
Your collection, your way
Colonize the New World.
GemRB is a portable open-source implementation of the Infinity Engine
A fun realistic multiplayer free-and-open-source first-person-shooter!
Easily generate cue sheets for CD images with compressed audio tracks.
Zoomable user interface (ZUI) with file manager, file viewers and more
Game engine supporting many 3D/2D formats and graphic effects
Online War system for IL-2 Sturmovik and Iron Front in ArmA 2
The centralized hub to manage and launch all desktop applications from
A free 3d game for PC that does not limit the player. Fight,Build,Gain
A promising chess program
2D Platform remake based on the game from the 1980s
A very efficient tutor.
LGSL (Live Game for PHP 5.4-8+: online status for various gameservers
A 16 bit style game on the 16-bit IBM XT.