It's my understanding that JSqueak was (is?) just a toy. OTOH, redline aims to be a full blown implementation of smalltalk that integrates with the jvm like jruby, scala, clojure, etc do. As you can see from the github repo, it's still pretty much a work in progress (plus a learning tutorial for interpreters/compilers).
I have high hopes for this series; I really enjoyed Peter Michaux's "Scheme from Scratch" series, from which the author says gained inspiration for his series:
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[ 3.0 ms ] story [ 22.1 ms ] threadIt seems to integrate better with the host JVM (like GST integrates with unix).
http://peter.michaux.ca/articles/scheme-from-scratch-introdu...