Excellent program, allows for monitoring multiple VNC sessions in 1 window (as thumbnails), then double-click to interact with any one sesison.

Quite helpful for monitoring multiple systems at once. Runs on Windows, OS X and Linux via Java Jar (for linux, just execute as …)

java -jar ./VncThumbnailViewer

You can then specify hosts/ports/passwords in command line, or save them to a host file for future loading as plaintext or encrypted.

Sources:

VNC Thumbnail Viewer.

Linux.com Article on the subject.