Is there a "universal" web UI for custom Linux NASes?

Got me thinking, cuz I've done my own solutions (not the popular ones, like OMV and the likes) and they work just fine, I really have no trouble managing them through the terminal, but I thought about other people (maybe people that like more managing things though a web UI) and I was like "is there something like this 🤔?".

The other reason I'm asking is because I also freelance as IT solution/support and sometimes I do custom solutions for clients, like a NAS, and I would like to ease things a little user side. Sure, that will cut down on my fees, but I like client satisfaction and I think they will appreciate it ☺️.