SDCC has been a nice resource for a variety of MCUs. I wish it had support for some of the 8-bit PIC chips like the PIC10 and PIC12... maybe one day!
Microchip XC compiler has support for those. They recently dropped the licensing requirement, so while it's not FOSS, it's freeware now, without limits.
you can also recompile xc gcc sources with some the paid features baked on, if you're so inclined and use mplabx pretty heavily
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