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www.telnet.org— Telnet’s home page.
https://help.ubuntu.com/community/SSH— The Ubuntu community documentation for SSH.
www.openssh.com— The home page of the OpenSSH implementation of SSH that Ubuntu uses. It is run by the same team as OpenBSD, a secure BSD-based operating system.
https://help.ubuntu.com/community/VNC— The Ubuntu community documentation for VNC.
www.realvnc.com— The home page of the team that made VNC at AT&T’s Cambridge Research Laboratory. It has since started RealVNC Ltd., a company dedicated to developing and supporting VNC.
www.tightvnc.com— Here you can find an alternative to VNC called TightVNC that has several key advances over the stock VNC release. The most important feature is that TightVNC can use SSH for encryption, guaranteeing security.
https://help.ubuntu.com/community/FreeNX— The Ubuntu community documentation for FreeNX.
www.nomachine.com/— Another alternative to VNC is in the pipeline, called NX. The free implementation, FreeNX, is under heavy development at the time of writing but promises to work much faster than VNC.