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.