Linux Show Player (or LiSP for short) is a free cue player designed for sound-playback in stage productions. The goal of the project is to provide a complete playback software for musical plays, theater shows and similar.
Here a list of the main functionality offered by LiSP:
Currently only GNU/Linux systems are supported.
The application is quite stable, is already been used for multiple performances by different people, but, due to the heterogeneous nature of the GNU/Linux ecosystem, my suggestion is to test it in a “working” environment to detect possible problems with some configuration.