Just Werks (mostly) Edition
Previous thread: >>492522495

>Commercial games for Linux
https://store.steampowered.com/search?category1=998&os=linux
https://itch.io/games/platform-linux
https://www.gog.com/en/games?systems=linux
https://www.humblebundle.com/store/search?platform=linux&drm=download
https://www.zoom-platform.com/search/any/any/any/any/any/linux/any/any
https://gamejolt.com/games?os=linux

>Libre games, source ports
https://libregamewiki.org/
https://osgameclones.com/

>Stuff for running Windows games
Wine (mostly used via Proton, Lutris, etc.): https://www.winehq.org/
Proton (comes with Steam): https://github.com/ValveSoftware/Proton
ProtonUp-Qt (installer for custom Proton builds): https://github.com/DavidoTek/ProtonUp-Qt
Bottles (Wine frontend): https://github.com/bottlesdevs/Bottles
Lutris (Wine frontend and game launcher): https://lutris.net/

>Other (non-Proton) compatibility tools for Steam
Steam Tinker Launch: https://github.com/sonic2kk/steamtinkerlaunch
Boxtron (for native DOSBox): https://github.com/dreamer/boxtron
Roberta (for native ScummVM): https://github.com/dreamer/roberta
Luxtorpeda (for other native engines): https://github.com/luxtorpeda-dev/luxtorpeda

>Unofficial launchers for platforms lacking proper Linux support
LGOGDownloader (GOG) (CLI only): https://github.com/Sude-/lgogdownloader
Minigalaxy (GOG): https://github.com/sharkwouter/minigalaxy
Legendary (EGS) (CLI only): https://github.com/derrod/legendary
Rare (EGS): https://github.com/Dummerle/Rare
Heroic (EGS, GOG, Amazon): https://github.com/Heroic-Games-Launcher/HeroicGamesLauncher

>Other cool things
https://github.com/ValveSoftware/gamescope
https://github.com/flightlessmango/MangoHud
https://gitlab.com/Infernio/libstrangle
https://github.com/CHollingworth/Lampray
https://git.dec05eba.com/gpu-screen-recorder/about/
https://github.com/Kron4ek/Conty
https://github.com/FeralInteractive/gamemode
https://github.com/scanmem/scanmem

>Linux on other boards
>>>/g/fglt
>>>/t/linux