Hosted CLI
Some really nify hosted CLI utilityes (telnet/ssh):
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rainmaker.wunderground.com (Telnet): Has existed for longer then I can remember (at least the late 90s)
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wttr.in (HTTP) A super-nify text-based weather forcast
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netris.rocketnine.space (SSH): A text-based multi-user tetris clone. Source available here
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Time! Not really hosted, but NIST maintains an old-fasion “daytime” service.
nc time.nist.gov 13