I use Prompt these days, but iSSH's Remote Desktop client was super useful back when I was doing admin work and didn't have the luxury of never needing to work on a Windows server!

As I recall, I also used its X server for remote display from an OpenGenera instance running on a Tru64 VM, back when I was still indulging my hobby for Lisp system archaeology, and network problems were stopping me displaying to the VM host's X server. Good times...