Lively Kernel is a Smalltalk-like environment that runs in the browser. It might be better for that server-side stuff than normal Smalltalk.
Unfortunately, it's written in JavaScript, which is not a good language, but I think it can also compile ClojureScript, which is much better. Cloxp is a related project that's more Clojure-based.
Amber Smalltalk also runs in-browser. The maintainer has kind of gone off in a weird direction, but it still works. PharoJS was supposed to be an alternative with a different approach, but I'm not sure if it was ever completed.
Emacs is the closest Lisp has to a Smalltalk environment. There are emacsen written in other lisps, like EdWin and Hemlock. These can be run in a terminal over ssh.
As an experiment, here's a thread for people to post about things they care about. Specifically, for things that are possible to contribute to, in some way, and preferably, to invite others to join.
Mine is buying and donating highschool textbooks to schools in the 'grey zone' of Ukraine (where the war kinda isn't fought, but few people would be surprised if it started.) I don't deliver them myself, though.
What's yours?