

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?

I’m not aware of general Linux specific tools for this (game specific ones do exist). However:
They both work by you running them in wine and pointing them to the game files created by Steam (or Gog or any windows game installed via Wine or Proton) in the Linux filesystem (e.g. /home/yourname/.steam/steamapps/common/game) instead of windows filesystem (e.g. C:\program files\game)
Modloaders with “bootstrap” fixes will also work; they just have to be installed and run in the same proton/wine prefix as the game. I.e. if you install Cyberpunk 2077 via steam, the bootstrap type mods need to be installed into the game folder or fake-windows file system that Proton makes for the game. It even has it’s own “drive C” folder for the rare times you need 3rd party tools. You also put tools into the game folder as you would on windows. If it has it’s own custom exe you can tell wine/proton to run that instead of the game or even before the game in the same prefix.
I mod games extensively on Linux; they work just as they do in Windows. I’ve played heavily modded Cyperpunk 2077 to completion (all the mod tools work via proton - that takes a little tweaking to get working but is doable - and many mods you just drop into specific sub folders; I played with about 50 mods and I didn’t find a single one that didn’t work on Linux specifically), Stardew Valley, Rimworld and Minecraft for example of bredth. Stardew, Rimworld and Minecraft even have linux specific tools to help.
This is less a case of games run via Linux not being moddable, and more that it has it’s own learning curve (in the same way modding on Windows has a learning curve). Once you understand how the linux filesystem and how proton/wine work, the world is your oyster. Protontricks and Winetricks are not just useful for getting games running or tweaking them, they’re a modders best friend.