Control.Monad.IO.Class
Control.Monad.Trans.Class
Control.Monad.Trans.Cont
Control.Monad.Trans.Except
Control.Monad.Trans.Maybe
Control.Monad.Trans.State
Data.Functor.Identity
A portable library of functor and monad transformers, inspired by https://hackage.haskell.org/package/transformers
Detailed package documentation (available shortly after this version has been published)