Comment by 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.