JamochaMUD
- Java client with most standard features. Windows and Linux builds available.
- http://www.jamochamud.org

KildClient
- GTK+ client with a built-in Perl interpreter. It runs under Windows and Linux.
- http://kildclient.sourceforge.net/phpwebsite/

TinTin++
- Console mud client, with most standard features. Windows, Mac OS X, and Linux builds available.
- http://tintin.sourceforge.net

MudMagic
- Gnome client for linux and windows with plugin support.
- http://www.mudmagic.com/mud-client/

GGMud
- GTK client with most standard features. Win32, OS X, and Linux builds available.
- http://ggmud.sourceforge.net/

eMUDs
- client written in EMACS with LISP scripting support. Runs on Linux and Windows.
- http://rom.copyleft.de/eMUDs/eMUDs.html

Trebuchet
- TCL/Tk client for Linux and Windows. Supports MCP.
- http://www.belfry.com/fuzzball/trebuchet/