You still see interesting efforts today. Here is a dmesg from a Tadpole SPARCbook 6500 booting 7.9 (released in May this year) that appeared on bugs@ just a few weeks ago (also, note who the person is that responds to that message):

https://marc.info/?l=openbsd-bugs&m=178663407424547

You of course also have the absolutely insane luna88k support [1] and I have myself been looking into getting my hands on a landisk [2] box as the Hitachi SuperH CPU is fascinating (I only knew of it from old arcade boards and the Sega Dreamcast).

[1]: https://www.openbsd.org/luna88k.html

[2]: https://www.openbsd.org/landisk.html