freer-effects (hackage): Implementation of effect system for Haskell, which is based on the work of Oleg Kiselyov et al.:  Freer Monads, More Extensible Effects  Reflection without Remorse  Extensible Effects  The key features are:  An efficient effect system for Haskell - as a library!  Reimplementations of several common Haskell monad transformers as effects.  Core components for defining your own Effects.
Keywords: bsd3|control|library|program|extensible-effects|freer-effects|freer-monads|haskell