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Wait HECK how'd I type ALL OF THAT, including the note about "no Objective-C" (reasoning: it's too much C) but forget Smalltalk/Self

Are there any languages I should know about that are like, "Smalltalk is to X" as Erlang is to Elixir or Scheme is to Racket? Or am I just describing Self here. What's a modern Smalltalk environment look like. Is Dave Ungar's magical Self IDE still publicly available. Was it ever public or did you just have to be in that one room in Mountain View in 2004 to see it