Can I play Super Mario Bros. on PC, Mac or Linux?

There is no known port for Windows, macOS and Linux yet.

Is anyone working on a port of Super Mario Bros.?

Nobody has published one on RecompHub yet. Games people want that still have no port are listed under What to work on next.

Super FamicomSuper Nintendo Entertainment System1993by Nintendo Entertainment Analysis & Development

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A remaster of the original Super Mario Bros., released exclusively as part of the Super Mario All-Stars bundle.

Can I play Super Mario Bros. on PC, Mac or Linux?: There is no known port for Windows, macOS and Linux yet.
Is anyone working on a port of Super Mario Bros.?: Nobody has published one on RecompHub yet. Games people want that still have no port are listed under What to work on next.