+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]] on this site; also a [library](/lambda_library) of lambda-calculus arithmetical and list operations (some relatively advanced)
+-->
+
+* [Scheme](http://tryscheme.sourceforge.net/)
+* [OCaml](http://try.ocamlpro.com/)
+* [Haskell](http://tryhaskell.org/) <!-- similar websites listed at https://wiki.haskell.org/Learning_Haskell#Trying_Haskell_online -->