Glasgow Haskell Compiler
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The Glasgow Haskel Compiler (or GHC) is a open source Native code Compiler for the functional programming language Haskell.
It is itself written in Haskell (a technique knwon as bootstrapping), and compies with the last language standard, called Haskell 98. Being so, its available in several platforms including Windows, and most varieties of Unix (like the numerous GNU/Linux flavors), and several different processor architectures.