Crash Course in Happstack. Happstack is a family of libraries for creating fast, modern, and scalable web applications.
A majority of the libraries are loosely coupled so that you can choose the technologies that are best for your particular application. You are not required to use any particular library for your database, templating, routing, etc. However, if you are new to Haskell web development, too many choices can be overwhelming. Homepage. Snap: A Haskell Web Framework: Home.