I am looking since a long time for a selfhosted tool that would allow the user to insert and visualize data in a hierarchycal structure (tree). Ideally custom schemas could be defined so that it can be also regarded as a rudimentary noSQL database. I've looked at the awesome-selfhosted page high and low for anything similar with no luck. Do you happen to know anything that could work? The best example for the functionality I am looking for is the open source desktop app treeline
Sounds like mind mapping software. I use freeplane (formerly freemind) desktop app but would love to find a self-hosted collaborative web based alternative with a database backend.