The EQEMU project is an attempt to recreate the Everquest server software, runnable from a Windows or Linux machine. Content is stored in a MySQL database, and allows you to create custom creatures, items, and quest content in game. Many in-game functions are supported, and functionality is expanded week by week by a very active development group and by the support of the user community.
Openglad is an SDL port of an old DOS game called Gladiator, which was developed by FSGames in the mid 90's. It is a top-down gauntlet-style RPG in which you hire team mates, go on missions, and improve your team with the spoils you reap. It can be played by up to 4 players (using split-screen), and features many classes, special abilities, and a scenario editor.
Vallheru is a turn-based, fantasy MMORPG written in PHP and MySQL (but may work with many other databases) with Smarty Template Engine, ADOdb, and PHP Mailer. It is based on Gamers-Fusion 2.5 with many modifications in security, speed, and features. It is currently available only in Polish.
Mason is a game system being developed by WorldForge. The primary focus for Mason is to enable players to build a persistent world in-game. Players will be able to manipulate items by creating new items from raw materials, attaching existing items together, or splitting items into component parts. Complicated structures such as houses can be designed on paper as a blueprint and then built with suitable building blocks and skills.
The Ark Roleplaying Kernel is a roleplaying engine that will allow game developers to create a full- featured role playing game, without having to write a single line of C++. All they have to do is to create game data (models, textures, world), and define the behaviour NPCs, in Lua. The engine contains a full outdoor 3D engine, with support for skeletal animation, and triangle- accurate collision detection. It also contains tools to create world and quests, and loaders for the most common low-polygon 3D formats.