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If you're strapped for cash you can run Blackmagic Probe firmware on a $2 bluepill board for JTAG with a fully open-soure tool set. (I run it on a $2 esp8266 for wireless JTAG. Open-source gives many options!)

Free as in speech, almost free as in beer. Less than a single (good) beer.

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Everyone loves a Chestnut Brown ale that your neighbor brewed in his basement. But my clients prefer name brands delivered in sealed bottles.

Yeah, the parent comment was talking about cheap alternatives. "Sealed Bottles" cost too much for hobbyists.

Also, is there a named-brand WiFi/Wireless GDB debugger?

For the sealed-bottle experience, you can buy the commercially supported Black Magic Probe hardware. Still open-source and better integrated into gdb than Segger etc.

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