A virtual machine for executing programs written in Hack.

DOOM Open Source Release

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Luanti (formerly Minetest) is an open source voxel game-creation platform with easy modding and game creation

Simple and Fast Multimedia Library

Native cross-platform MongoDB management tool

Hosting node.js applications in IIS on Windows

Apache OpenOffice

Simple and Fast Graphical User Interface

An easy to install gem version of the Ruby bindings to Qt

GtkRadiant GPL Source Release

An open source two-dimensional platform game.

Croc is an extensible extension language in the vein of Lua, which also wishes it were a standalone language. Also it's fun.