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by TD-Linux 3378 days ago
Any of the Cortex-M* series are also generally a good choice, for example the STM32* series. All of these are supported in mainline gcc, and have open source support libraries provided by the vendor or via libopencm3. Be a bit careful, as some vendors like to use proprietary licenses for their headers, but in most cases there is at least one open source alternative.

And of course the RISC-V HiFive1, though it's still very new and in sampling quantities.

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And you can use OpenOCD to program/debug most ARM devices.