In this video, we can see an example of a "hello world" in Ruby on rails and the same example done in Seaside. It's interesting to see how to do an example in Ruby on rails, which is a "copy" of the Seaside framework. Ruby is a language very influenced by Smalltalk, but it is still a language.
In this video the author James Robertson is using a MAC OS and VisualWorks Smalltalk.