LevelDB is a fast key-value storage library written at Google that provides an ordered mapping from string keys to string values.

Flexible level editor

[DEPRECATED] Git mirror of the 0 A.D. SVN source code (migrated to https://gitea.wildfiregames.com on August 20th 2024)

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

A reimplementation of BioWare's Aurora engine (and derivatives). Pre-pre-alpha :P

FIFE is a multi-platform isometric game engine

Actively maintained LPMUD driver (LPC interpreter, MudOS fork)

Roguelike Toolkit - Modern C++ (14) SFML-based toolkit for creating roguelikes.

Dworkin's Game Driver, an object-oriented database management system originally used to run MUDs.