Scotty - Scotty is a Haskell framework inspired by Ruby's Sinatra.
Shorten.REST - A URL shortener API you can depend on
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.
PixelMe - URL shortener for savvy marketers
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.
Pixela - Record and Track your habits or effort. All by API.