Looking for a application that lets me Head Hack?

I am looking for a application that helps me head hack. I want to make some custom models for me and my friends server. Can anyone help me?

 I mean something like this > http://www.youtube.com/watch?v=wv4zrzSsNuo

[editline]13th February 2011[/editline]

Ok, So I got a brief idea on what to do. The only problem is that Maya is taking forever to download and the MDL to SMD download isnt working…Anyone know what to do?

I got MilkShape 3D by the way.