Most widespread is perhaps my Smalltalk Balloon rendering.
I've been a member of the Squeak community since 1997, with many contributions, and being elected to the Oversight Board for many years.
Lately I have had most fun with SqueakJS, a virtual machine that runs many old and new versions of Squeak right in your web browser.
Inspired by my SqueakJS VM, I wrote a Smalltalk-78 interpreter which also runs in a web browser.
It was used by Alan Kay for various talks, including his 2014 Tribute to Ted Nelson, and is featured in Dan Ingalls Smalltalk Zoo accompanying his Evolution of Smalltalk paper presented at HOPL-IV. Also, both Dan and Adele used my VMs for their demos at the Computer History Museum's Smalltalk-at-50 celebration.
My first Smalltalk was VisualWorks, and I've been using it until about 1998.