hgmp (hackage): Types and instances, and marshalling between Integer and Rational and the corresponding GMP types, along with raw foreign imports of GMP functions.  Allows FFI to GMP code (whether in GMP itself or in third-party code that uses GMP).  Supports only GHC with integer-gmp or ghc-bignum, this might change if there's any demand.
Keywords: bsd3|library|numeric