I've been involved with the following software and/or hardware projects over the years.
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Shoehorn is a statically, ahead-of-time compilable dialect of the Forth programming language.
It is designed to be easy to retarget to any architecture;
if you have an assembler capable of outputting raw binary code,
you should be able to bring up a new processor in as little as a few days.
Maybe even a single day.
I have been successful targeting the 65816 and RISC-V instruction sets with it.
Its purpose is to help bring up new Forth or Forth-like environments from scratch.
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Kestrel Computer Project.
Originally intended to be a grass-roots organization of software engineers,
hardware engineers, and ordinary computer users, intent on specifying
and building home computers whose components were free and open source from soup to nuts.
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VDC-II is an open hardware FPGA-hosted clone of the CSG8563 VDC chip, found in the Commodore 128.
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Kestrel-2EX is (currently) a fantasy platform based around my Kestrel-2 computer design, and inspired by Uxn/Varvara and the Commodore 64 version of GEOS.