Haskell's actually got a pretty great (if informal) standard which has been used to write a number of different compliant Haskell compilers. GHC is obviously th

Haskell's actually got a pretty great (if informal) standard which has been used to write a number of different compliant Haskell compilers. GHC is obviously the most popular open source one, but Standard Chartered Bank has its own Haskell compiler it uses a great deal of in production, for instance.