The best open source alternative to Lutris is Heroic Games Launcher. If that doesn't suit you, our users have ranked more than 50 alternatives to Lutris and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Lutris are Playnite, PlayOnLinux - PlayOnMac, Bottles and Retrom.
Lutris alternatives are mainly Game Library Managers, but if you're looking for
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It's less buggy and is very intuitive in how to install your games and view the Stores from Epic and GOG. Your game library is clean and and easy to view, install and play. There's no configuration, or very little, needed in order to play your games. Lutris is very clunky compared. So much so, that I installed Ubi Connection as a non-steam game, installed it through Steam and now launch Ubi-Connect through Steam and don't use Lutris at all. It's that bad.