The Evolution of Smalltalk from Smalltalk-72 to Squeak [video]
The most active Smalltalk inspired community seems to be Pharo.
https://pharo.orgI have avoided calling Pharo "Smalltalk" as it has evolved from the original fork of Squeak and the project is evolving and modifying from its Smalltalk origins.My personal favorite language that has evolved from Smalltalk is Newspeak. https://newspeaklanguage.orgThe current version runs on top of WASM and can be used in a web browser. Gilad Bracha is going some exciting and interesting things with this language.