There is no SSH client, nor has anyone attempted to write/port one AFAIK.
There has been a port of RDP client but its unfinished. (viewtopic.php?f=40&t=3054
) If you know C, you might be able to fix it.
There is however a native VNC client but is outdated and does not support any encryption whatsoever. I could update it if you can convince me to re-arrange my priorities.
No support for Spice or Citrix ICA exists that I know of.
If you are looking for a ready made solution, you might be better of with a small linux distro.