Minerva and SMSQ/E, both related to Sinclair QDOS, the original OS for
the Sinclair QL.
And EmuTOS, a FOSS recreation of Atari TOS & GEM, which reached v1.0
about 6 months ago.
I knew about the 1st 2, but this video taught me a lot. It's an
insular community and most materials are aimed at people who already
know about it.
I wrote a blog post to explain a bit of the history and context:
Found via the m68k.info community:
Which in turn I found when I asked if there were any 16-bit homebrew
computers out there and learned of the Kiwi 68K:
Liam Proven ? Profile: https://about.me/liamproven
Email: lproven at cix.co.uk ? gMail/gTalk/gHangouts: lproven at gmail.com
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UK: +44 7939-087884 ? ?R (+ WhatsApp/Telegram/Signal): +420 702 829 053