Deliantra is an advancement of the crossfire multi-user RPG game. Unlike the original project, it focuses mainly on stability and playability, but also adds modern technology such as map scripting, Perl server extensions, asynchronous I/O, higher resolution graphics, and better client support.
JXFire is a Multi-User Dungeon game written in Java. It is using the Sun Gaming Server (aka "Project Darkstar") framework. JXFire aims at testing various game mechanisms rarely used, like uncertainty in gaming data perception, self-organizing ecological systems, or non-instantaneous information propagation.