Software > Programming >
(on Wikipedia)
http://www.smalltalk.org/
A programming language.
Smalltalk is intriguing. Very intriguing. I was turned onto this while Ruby was a live project, where the rabbit hold led me to Seaside.
Smalltalk leads to Squeak, the open source implementation, and through one if its main contributors (Alan Kay) leads to the Croquet Project.
