I think Pixelorama (I’m on mobile right now so don’t want to drag up a link) is also FOSS and has a more comparable feature set.

FreeCAD is probably what you’re looking for, it had a bad UI but just released 1.0 recently and is pretty decent now. Also I really recommend checking Pixelorama over libresprite for a FOSS pixel art tool.

You’re kidding right? The Steam client is overflowing with features, beyond the nice and simple mod manager, multiplayey systems for easy joining it also has a full featured discord alternative inside the chat system with voice and text chat and I think even screen sharing. To compare it to Xbox achievements is just insane for how much the steam client provides.