Maxima should also deserve a mention I think

excellent point, thanks. It's added. I mostly prepared the post with the reddit history, that means someone missed the opportunity to inform the broader Lisp community there.

For Maxima, what could be added?

Maxima 5.46 came out (https://sourceforge.net/p/maxima/code/ci/master/tree/changel...) in April. It also had a number of bugfixes and some new features, personally I am fond of getting rid of the python dependency for building the documentation, but I suppose preventing gensyms from leaking and fixing limit going into an infinite loop may be considered more important by some.

Thanks, added.