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Is there anything like this, but for serial (ie. UART)?

https://www.saleae.com/

That looks great, although I thought about something more high level, a software which works with USB-UART converters. Like minicom or HyperTerminal, with built in protocol debugging capabilities.

https://sigrok.org/

Also check out the Pulseview GUI front-end for sigrock, it is excellent.

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