musecore is opensource and supports tab playing and editing alongside notation: https://github.com/musescore/MuseScore https://github.com/musescore/MuseScore ed

musecore is opensource and supports tab playing and editing alongside notation: https://github.com/musescore/MuseScore https://github.com/musescore/MuseScore edit: but I guess reading your comment again you're looking for something web based.