About PerlMUD 3.0  Now open source! Released under the MIT
license July 4th, 2011. Happy independence day.  What is
PerlMUD?  PerlMUD is a MultiUser Dimension (MUD), a text-based
environment that allows multiple users to converse, explore, and
interact. PerlMUD is written in Perl 5 and is highly compatible
with the well-known TinyMUD command set, which provides a
friendly interface to your online environment.  Complete Perl
source code is included. Administrators can easily extend the
PerlMUD system by writing additional Perl code.  What's new and
nifty about version 3.0?  Version 3.0 is 100% backwards
compatible with previous releases and the databases that they
produced.  Version 3.0 has two major new features:    • Topics
offer some of the best features of IRC, while respecting the
style and personality of MUD systems. Topics provide a way to
hold open conversations on specific topics in a crowded MUD room
while giving others the opportunity to opt out if they choose.
See "help topics" for more information