Scotty - Scotty is a Haskell framework inspired by Ruby's Sinatra.
PixelMe - URL shortener for savvy marketers
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.
Short.io - Short.io makes short links (vanity urls) on your own domain. Free signup, analytics and API. Chrome, slack, zapier and segment integrations.
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.
chl.li URL shortener - A simple, modern, free and privacy-friendly URL shortener.