Happstack is a haskell web framework, designed so that developers can prototype quickly, deploy painlessly, scale massively, operate reliably, and change easily. it supports gnu/linux, os x, freebsd, and windows environments.

happstack provides you with all the components you need to build and deploy your application, which is completely self-contained. particularly, happstack provides the application with a distributed and persistent data storage layer, capable to interact with the application itself directly in terms of haskell data structures.

happstack-server contains the http server itself.

this package provides a library for the haskell programming language. see http://www.haskell.org/ for more information on haskell.