From what I've seen there has been some confusion over the state Lutris as the last version was seemingly 0.5.18 in Dec 2024 and "nothing since". However version 0.5.19 is available as a tag within the github repository from Feb 2025, and they're working on 0.5.20. It sounds like there is some issue with the 0.5.19 git, and development overall has slowed down as the lead dev is working full time.

I think a lot of this shows how open source software is so dependent on a small number of active people keeping projects going and there isn't money flowing into otherwise very important and popular projects.

I like Lutris but I think Heroic is probably more fully featured than Faugus at present.

Faugus is an UMU-Launcher. UMU Launcher is essentially a open implementation of the Steam Runtime Tools and Steam Linux Runtime, which can run independently of Steam itself - it essentially aims to be Proton as you get in steam, without needing steam running. It aims to be a single shared implementation to simplify Proton fixes and implementations which are otherwise fragmented and duplicated - each game gets fixes applied individually by each of the existing games launchers in their own projects. It's a laudable aim, but it's not clear whether it can achieve it's aims as Lutris, Heroic, Bottles etc are still doing their own things. So at the moment it's another launcher?