CoolMud is a network-accessible, multi-user, programmable, interactive and distributed system designed for the construction of text-based adventure games, conferencing systems, and other collaborative software.
CoolMUD was written in 1992 by Stephen F. White (also TinyMUCK and MOO).
The 2.3 version of CoolMud was created by Robin Powell in 1998. It includes some new string functions, a list splice operator, the ability to run background tasks forever with the sleep command. Aliases for objects was added using '$' sigil. They are defined on the System object (#0). The core database features furniture. All the help information from the manuals was added into the core database. Editing commands have been enhanced.