High-level C++ framework to ease game development
OSDL: Object-oriented Simple DirectMedia Layer. OSDL is a high level open source (LGPL/GPL) portable multimedia library, built upon Sam Lantinga's SDL (http://www.libsdl.org). Its goal is to provide a high level C++ framework to ease game development.
General-purpose Portable Open Source C++ Library
The Ceylan library is a Free (LGPL/GPL) General-purpose Portable Open Source C++ Library, offering frameworks and abstractions of lower-level layers to ease software development.
Erlang written IRC bot and possibly client
Turn-based MMORPG written in Erlang (server side) and Java (client side) using the XMPP protocol for communication. Sanctuaire's goal is to maximise the game experience with tactical/strategical/economical/political and social actions and interactions.
XP Dojo is a place where Extreme Programming teams assemble to practice their art.