AIDA/Web

AIDA/web is another Smalltalk web framework-application server. Like it says on the Wikipedia page:

Aida/Web

Developer(s)	Janko Mivšek and The Aida/Web Community
Stable release	6.7 / September 14, 2014
Written in	Smalltalk
Operating system	Cross-platform
Type	Web framework
License	MIT License[1]
Website	www.aidaweb.si

Aida/Web is an object-oriented, open source Smalltalk web applicationserver using the model-view-controller (MVC) architectural pattern.

A new version of the software was released recently, version 6.8 announced in various mailing lists May 2020.