Lutris is also a great option, actively contributing to it. Got a slightly different focus than Heroic, but a lot more features as well. Basically a one-stop shop once you got familiar with it. Really needs more people that can contribute though given the huge amount of platforms and launchers it attempts to cover (literally all of them).
Heroic Games Launcher is pretty great for games from GOG and Epic. You can run games with Proton just fine.
Lutris is also a great option, actively contributing to it. Got a slightly different focus than Heroic, but a lot more features as well. Basically a one-stop shop once you got familiar with it. Really needs more people that can contribute though given the huge amount of platforms and launchers it attempts to cover (literally all of them).