etamoo
LambdaMOO is a network-accessible, multi-user, programmable, interactive system well-suited to the construction of text-based adventure games, conferencing systems, and other collaborative software.
EtaMOO is an experimental multithreaded implementation of LambdaMOO in Haskell with LMDB-backed persistence and anticipated ready support for Unicode MOO strings and 64-bit MOO integers. The implementation follows the specifications of the LambdaMOO Programmer's Manual, and should be compatible with most LambdaMOO databases as of about version 1.8.3 of the LambdaMOO server code.
N.B. This software is still under development and not fully complete.