[edwtjo]

Why? "Haskell" also works on hugs,yhc,uhc,... http://www.haskell.org/haskellwiki/Implementations Most implementations are BSD/GPL Licensed. Haskell itself (thinking of Haskell Prime, Haskell98) is a research/community driven project and, as such, open/transparent. For GHC there is even an intermediate format allowing you to run your code on stuff like llvm.

[riffraff]

the original message was talking of specific "stacks", which in my understanding includes an abstract language and a concrete implementation (I'd say also some accompanying development tools: if not an ide, at least a repl, debugger, build system). "haskell" as such would not qualify, while ocaml, scala and ghc would.

[vegai]

ghc is the only industrially viable choice at the moment, though.