Tinyfugue is a very popular MUD/MUSH command line client rich in functionality. When using tinyfugue in a graphical environment the only thing it lacks is the peripheral buttons and options that are available to graphical clients. Gtinyfugue aims to embed tinyfugue within a GNOME wrapper that provides the GUI widgets that make tinyfugue easier and more comfortable to use on a day-to-day basis. Embedding tinyfugue rather than using simple telnet gives the gtinyfugue user the advantage of the depth of tinyfugue functionality.
lfgapp is a client and server which provides a looking for group (LFG) service to be used alongside MMORPGs. A player community (player-run guild for example) can run a central LFG server and then group leaders can advertise groups. Players can then look for groups and add themselves to waiting lists for groups.
libtelnet is a small library for writing telnet protocol handlers in C. It uses a fully correct state machine model and full RFC 1143 (Q Method) option negotiation. It includes optional support for MUD-specific protocol extensions such as MCCP2 and ZMP. Several test programs are included, such as the very useful telnet-proxy utility.
mcl is a MUD client running in a Virtual Console under Linux or using standard TTY routines under any other UNIX. Embedded Perl or Python offer very high tweakability. Other features include huge scrollback, a stable input line with the MUD prompt, Perl regexps for actions and substitutions.
Mooix is a multiuser object-oriented dimension (a MOO) layered over top of your favorite Unix system. To the user, mooix looks much like any other MOO. To the programmer, mooix objects look like directories full of files: executable methods, properties, and links to other objects. MOOs have historically had poor support for such things as real programming languages, encrypted logins, multitasking, and editors. Mooix inherits all of these things from the Unix system it is based on. At the same time, it's not wedded too tightly to Unix (e.g., it implements its own permissions system that is much more suited to a MOO environment than the historical Unix system).
Mudsbuilder is a set of tools for the creation of dungeon maps in MUDs. Once a map is created, the user has the ability to generate LPC code from that map for virtually any mudlib. It supports standard (south, north, east, etc.) exits, ups and downs, and miscellaneous exits, such as one-way exits.