it seems like a new version of this kind of thing pops up often enough, but it seems like the people making them have never heard of AppStream. like I guess managing webapps too is unique, but everything else and more support AppStream, along with existing gui managers like kde discover, gnome software, etc

If I got it right, this is like Synaptic but across multiple package managers, right? It sounds useful, I'm going to give it a try.

EDIT: in Linux Mint, I couldn't install it through the command sudo pip3 install bauh; I think the system is throwing a hissy fit for trying to install stuff outside a sandboxed environment. Downloading the AppImage works fine.

It looks off in Cinnamon, as it relies on the Qt styles installed. It works great though - specially for AppImage and Flatpak applications.

I wish it had a deborphan-like filter, allowing you to see only packages that do not depend on other packages. That would be a godsend for system cleaning.