I still find people looking for this stuff.
My old Unix21 project has petered out long ago. It ran live for a few years on machines at exaflops.com when I was running a startup data center here in SE Aus. Unfortunately, a major health upset threw those plans out the window in the 2000s and the software has since been (mostly) lost after the company was sold.
Other material that was once here dated back to the 1980s and is probably regarded as
elementary now. I was once interested in synchronization primitives.
E.g. the non-block, non-wait methods of Herlihy
But I will monitor the situation and if there is continued interest from humans or bots I'll try to dig back into those crates of 8" floppies (how hard can it be to get an 8" DSDD drive working again? ;) and put something back. But you will need access to a reasonable lab to get the carbon dating right.