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pegasus-frontend
A cross platform, customizable graphical frontend for launching emulators and managing your game collection.
Pegasus - seems like a proper launcher that can incorporate games from multiple stores? It seems promising.
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Scout Monitoring
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Lutris - doesn't really work as a storefront in and of itself, but offers loads of scripts for managing third-party games and apps not from Steam.
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Heroic Games Launcher - probably the most cohesive of these kinds of efforts. Supports multiple alternative storefronts, manage a library of games, and a variety
