GZDoom is an enhanced port based on the sources of Doom for Windows. Changelog.
Devilution - Diablo devolved is a reverse engineered source project of Diablo from 1996.
A new version of the open source VM VirtualBox has been released. VirtualBox is available for different operating systems like Windows, Linux, Solaris and Mac OS.
Yamagi Quake II is an enhanced client for Quake II.
GZDoom is an enhanced port based on the sources of Doom for Windows.
CorsixTH is reimplementation of the game engine from Theme Hospital.
FreedroidRPG is an open source role playing game which was inspired by the C64 game Paradroid.