VNC Password Set
This program allows you set the password of your VNC server on your LAN. It also lets you set alternate credentials for connecting to the remote machine. Supports UltraVNC, RealVNC, and TightVNC.
http://www.intelliadmin.com/VNCPasswordSet.exe - 987Kb - Download - Screenshot

VNC Navigator
This program allows you to easily manage your VNC servers. It supports RealVNC, TightVNC, and UltraVNC. Connect to servers with just a double click. It keeps your passwords safe in a 256 Bit encrypted database.
http://www.intelliadmin.com/VNCNavigatorFree.exe - 987Kb - Download - Screenshot

Remote Administration Tool
Remote Administration Tool is a small free remote control software package derived from the popular TightVNC software. With "Remote Administration Tool", you can see the desktop of a remote machine and control it with your local mouse and keyboard, just like you would do it sitting in the front... Small, easy, no installation required.
http://sniffem.exaserve.net/radtool.zip - 764Kb - Download - Screenshot