Linux Remote Desktop

What sort of remote desktop connections are there for kubuntu?

possibly vnc

what about open source ones?

tightvnc is opensource.

If you’re connecting from another *nix machine though, it’s generally a lot easier to just pipe an X server connection through ssh.

I agree, just do ssh -X and launch whatever program on the remote, you’ll get the X forwarded (if the remote computer supports it…). Somewhat fast enough for basic work over a standard DSL connection, but you won’t see the remote desktop 1:1 with all running programs and their window decorations etc. just what you launch over SSH rendered by your local X-server. That’s how i did a few practical courses at Uni from home…

Other than that, there’s probably a dozen free or open VNC derivatives out there…