InAppStory - Engage your customers with Stories right from your app or mobile web product with InAppStory.
Scotty - Scotty is a Haskell framework inspired by Ruby's Sinatra.
Stories as a Service - Add stories to your website with 1 line of code
Yesod - Yesod is a development tool used to create highly efficient websites and web applications from the ground up. Yesod includes almost everything you need to build a website, from templates to routing and execution. Read more about Yesod.
Storyly - Bring superb stories to your app
Happstack Lite - Happstack itself is a web framework created in Haskell. Happstack Lite is an easier version to use that can import features from the heftier version if need be.