Of course, there's an argument to be made that talking about SPARC ought to live in the Retrocomputing section.
But I still work on SPARC, have a small number of servers (a T4-1 and a couple of T5140s) that support the work. I don't expect this to be of major interest to most, but possibly the most visible part of the SPARC work I do is the OpenJDK port, which supports SPARC and x86 on Solaris and illumos. While the x86 port is current (so supports 17, 21, 25 LTS and everything in between and up to the current development of 27), SPARC goes up to JDK18 at the moment. Fortunately it's good enough to run Jenkins, which has bought people a little bit of time, although the minimum version will get bumped at some point.