OpenKJ is cross-platform open source karaoke hosting software licensed under the GPL version 3.
It is developed on Linux (fedora, specifically) and built and tested on Linux, MacOS, and Windows. In theory it should build fine on the BSDs as well, but nobody has verified that.
It also now features integration with OpenKJ Songbook for web based search and song submission.
This was the application that got the OpenKJ Project started. It was originally created because I wanted to host my shows on Linux but there were no viable hosting applications on that platform at the time.
OpenKJ Tools is a collection of tools to help maintain your karaoke library.
It currently has the following capabilities: