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Lutris is an open source gaming platform for GNU/Linux.
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Steam, Epic, GOG, retro consoles, and more... all from your couch.
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UALinux / Technology of the future - already today.
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The definitive couch gaming experience.
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Drauger OS is an Ubuntu-based Linux desktop gaming distribution that ships with many modifications and optimizations over stock Ubuntu that are intended to improve gaming performance and the gaming experience.
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SuperGamer is a live DVD currently based on Ubuntu (previously it was based on VectorLinux), intended to showcase gaming on Linux.
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GuestSneezeOS is a robust, free-to-use, lightweight, immutable, operating system designed to bring the functionality of Valve's SteamOS to a wide range of devices, including desktops, laptops, and more.
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A cool OS written in Scratch.