3D Mud Client

1. Is the wizard client and mud client Windows only?
Yes

2.How can I make it so that rather than speaking something in the communication box the mud command is executed instead? (eg instead of saying 'who' will instead list players)
You can change the config ini file 'mudcommandsinchat' attribute from 0 to 1 (mudcommandsinchat=1)

3. What skills do I need to use the 3D mud client?
Some skills that are necessary to build your own MMORPG with 3D mud client is XML, mud programming, Linux if using SWLPC mud, 3D modelling and texturing. If these are unfamiliar to you you then the 3D mud client may be too hard for you.