For more Lisp+Immix action there's also Andy Wingo's article and talk about a new GC for Guile from earlier this year:
Article: https://wingolog.org/archives/2023/02/07/whippet-towards-a-n...
Article: https://wingolog.org/archives/2023/02/07/whippet-towards-a-n...
With that said, the upcoming immix collector is really friggin exciting.