Shirogane Ryu

It’s not a self-hosted but I think that Image Toolbox (https://f-droid.org/packages/ru.tech.imageresizershrinker/) meets your requirements

I Used Gondolin for my PC but after reinstalling I didn’t put it back on and left the default

As many have already told you, you can contribute to OSM, I have put in it almost all the establishments in my area (Not at Big area but…). Although soon I have to update them