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LambdaMOO is an online community of the variety called a MOO. It is the oldest MOO today and one of the most active, with just under 3000 regular members. Typically, around 100-200 members are connected at any given time./wiki/

“The LambdaMOO-Builder is a tool to support the development of virtual realities. It is a graphical user interface for the programming of the LambdaMOO-Server Version 1.8xx”

“LambdaMOO is both the name of a MUD and the name of MUD server software. This page is about the server software, not the particular MUD.”

LambdaMOO Programmer’s Manual by Pavel Curtis

LambdaMOO Status Blog//For LambdaMOO users who suspect LambdaMOO might be down and seek knowledge.”

"Inofficial LambdaMOO Beginners Quick Reference"  

From the LambdaMOO help system: > help LTAND

Lessons from LambdaMOO: A Social, Text-Based Virtual Environment

LambdaMoo Links

LambdaMOO

The Lost Library of MOO