FreeNX 0.4.4 on Ubuntu AMD64
I've repacked my working Ubuntu FreeNX install and updated it to work on Gutsy.
Add my repo to your /etc/apt/sources.list:
# FreeNX for AMD64
deb http://www.northern.ca/projects/freenx/ ./
Then follow the instructions at http://www.northern.ca/projects/freenx/!freeNX_for_Ubuntu_AMD64.txt
I've mirrored the Windows client there, I don't have the original linux NX clients, though they might be found at http://mirror.ubuntulinux.nl/dists/dapper-seveas/freenx/
NOTE: Users dist-upgrading to Gutsy must manually sudo aptitude install dbus-x11 to satisfy the dependency of FreeNX (otherwise you will your sessions stop working with no real indication as to why - NX> 707 SSL tunneling: 0 - Killed by signal 15. ). Due to the splitting of the dbus package into dbus + dbus-x11 anyone going from Feisty -> Gutsy may have to manually install dbus-x11.