Suggest an alternative to

RetroArch

Cross-platform, sophisticated frontend for the libretro API. Licensed GPLv3.

Why do you think that https://github.com/ValveSoftware/steam-for-linux is a good alternative to RetroArch

A URL to the alternative repo (e.g. GitHub, GitLab)

Here you can share your experience with the project you are suggesting or its comparison with RetroArch. Optional.

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