BucketMUD is a single-threaded hack-and-slash MUD engine, based on the EmberMUD server. It is currently in a state of heavy, unstable development.
Development is coordinated through GitHub, with a public read-only git repository for developers to pull the current code from and an issues database for tracking bugs, feature requests, and other tasks. Forums are available for in-depth discussion about ongoing development.
This is the live development server where everyone is welcome to test the engine, or to just hang out and chat.