Launchers

ProtonUp is a Qt application for installing and managing Wine and Proton, and others. A free and open source game

XIVLauncher is a launcher and Linux integration for Final Fantasy XIV Online. A free and open source game

kramo Cartridges is a simple application to run your games. A free and open source game

Lutris – allows you to install and run games from the Humble Bundle, GOG and Steam launchers. A free and open source game

Heroic Games Launcher is an open source game launcher, access to their Epic, GOG and Amazon games

ScummVM is a program that allows you to run various games, provided that their files are available (which were not developed for your system)

GDLauncher is a simple but powerful Minecraft custom launcher with a strong focus on the user interface. Free and open source game