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This is a list of games and software available on Steam that do not require the use of the Steam client itself (after the game or software is downloaded using the client), do not contain any third-party DRM (Digital rights management, e.g. Games for Windows - LIVE, Uplay, Denuvo Anti-Tamper, etc.), and do not utilize the optional Valve CEG (Custom Executable Generation) component, making them effectively launcher-free applications once downloaded. This allows usage of the game directly both offline and without utilization of Steam or third-party software running.
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