Clients For Windows
Zmud
http://www.zuggsoft.com/
Wintin
http://www.wintin.org/
Wintin95
http://www.rasbora.pwp.blueyonder.co.uk/wintin.htm
Ytin
http://lightning.prohosting.com/~xine/ytin/
The Mud Connector has a ton of other clients available.
The Mud Connector Clients
http://www.mudconnect.com/resources/Mud_Resources:Mud_Clients.html