Actalk - Briot, 1989. Smalltalk-based actor language. "Actalk: A Testbed
for Classifying and Designing Actor Languages in the Smalltalk-80
Environment", J-P. Briot, Proc ECOOP 89, pp.109-129.
Actalk Programming Language
http://www.programming-languages.co.uk/actalk.html
Large list of computer programming languages arranged alphabetically, with explanations.