I like learning about software that is out there (both old and new). As long as it is not a karaoke hoster competitor, please feel free to share.
Side note, anti-virus software uses system resources and memory because they constatnly scan everything you are running during a show. I would not run them on a show computer if you can help it. If you hook the computer up to the net to do Hoster updates only, then disconnect, you should never have to worry about a virus.