We collect here versions of the programming languages we'll be looking at that you can run in your web browser:
+* [[Untyped lambda calculus evaluator|code/lambda_evaluator]] on this site
+
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-* [[Untyped lambda calculus evaluator]] on this site; also a [library](/lambda_library) of lambda-calculus arithmetical and list operations (some relatively advanced)
+; also a [[library|code/lambda_library]] of lambda-calculus arithmetical and list operations (some relatively advanced)
-->
* [Scheme](http://tryscheme.sourceforge.net/)
-* [OCaml](http://try.ocamlpro.com/)
+* [OCaml](http://try.ocamlpro.com/) <!-- see also http://ocaml.org/learn/teaching-ocaml.html#Inthebrowser -->
* [Haskell](http://tryhaskell.org/) <!-- similar websites listed at https://wiki.haskell.org/Learning_Haskell#Trying_Haskell_online -->