This page will grow as I find new public JACOsub script archives. If you have any suggestions, or you have a site you wish to appear here, please let me know. If you just want to see an example of a script doing most everything possible, look at the demo.jss script.
I highly recommend Sconv, a sophisticated tool to convert most any subtitling script format to any other format. It has good JACOsub support.