Bookmark this. Download it. Print it. Save it. Do something. This is another great article by Brian Madden discussing almost every free tool for Citrix and Terminal Server Environments. This is an absolute must-read.
"There are a lot of great FREE tools and utilities out there that can really help in Citrix and Terminal Server deployments. This article contains links to the tools I use most often. (This is not a listing of every single tool known to humankind. Instead, this is a listing of the free tools that I myself actually use.)"
Read it here.