Random numbers and stuff...

Data.Random.Source exports the typeclasses for entropy sources, and Data.Random.Source.* export various instances and/or functions with which instances can be defined.

Data.Random.Distribution exports the typeclasses for sampling distributions, and Data.Random.Distribution.* export various specific distributions.

Data.Random.RVar exports the RVar type, which is a probability distribution monad that allows for concise definitions of random variables, as well as a couple handy RVars.