https://github.com/GloriousEggroll/ULWGL
From the github:
WHAT DOES THIS MEAN FOR OTHER LAUNCHERS (lutris/bottles/heroic/legendary,etc):
- everyone can use + contribute to the same protonfixes, no more managing individual install scripts per launcher
- everyone can run their games through proton just like a native steam game
- no steam or steam binaries required
- a unified online database of game fixes (protonfixes)
Proton is open source. Valve has also been incredibly supportive of and is actively contributing to an open ecosystem for Linux and SteamOS. Desktop mode in SteamOS exists so end users can install whatever tools they want on it.