Open Source Software for Haskell
IHP
IHP is a batteries-included web framework optimized for long-term productivity and programmer happiness. IHP is written in Haskell and allow you to build web applications using functional programming with an incredible type system. IHP provides a unique take on web applications building and provides a GUI which makes creating database tables, running migrations and generating MVC scaffolding even easier.
Nubo
Nubo is a self-hosted file sharing application that runs on macOS, Linux and Windows (64-bit versions only). The application consists of two parts, a cloud-base part which is s mall PHP application that must be installed on a server, and the client which can should be installed on your local machne to be able to syncronise and share with the cloud. In that sense Nubo is similar to other file sharing solutions in that you drop files into a special folder on your computer to save and sync with cloud instance.
PostgREST
PostgREST is a standalone web server and development tool that automatically turns your PostgreSQL database into a RESTful API.