Haskell 98 contravariant functors
OTHER License
Contributions and bug reports are welcome!
Please feel free to contact me through github or on the #haskell IRC channel on irc.freenode.net.
-Edward Kmett
Provides Data.Void, which is in base since ghc 7.8 or so
Haskell 98 Profunctors
mtl friendly exceptions
the EitherT monad transformer
Indexed Functors for GHC 7.6
Low-dimensional linear algebra primitives for Haskell.
Clojure-style transients for Haskell
Hash consing for arbitrary Haskell data types
categories from category-extras
semigroupoid products and coproducts
representable functors
Category theory for Haskell with a lens flavor (you need GHC 7.8.3, not 7.8.2 to build this!)
Dual Traversable
Haskell 98 bifunctors, bifoldables and bitraversables
Tools for programming with ConstraintKinds in GHC