ShellCheck, a static analysis tool for shell scripts

Building a modern functional compiler from first principles. (http://dev.stephendiehl.com/fun/)

A type-safe Haskell SQL library

arbtt, the automatic rule-based time-tracker

Generate Haskell bindings for GObject-Introspection capable libraries

A graphical tool for profiling parallel Haskell programs

A Haskell blog

Mid-level bindings for sqlite

A command-line interface description language and parser that will make you smile

Persistent GHC-powered background server for FAST haskell development tools

Mid-level client library for accessing PostgreSQL from Haskell

Stack Builders Tutorials.

Library and utility for processing cabal's plan.json file

Haskell library for PDF generation (graphics and typesetting)

Quickly hashing all subexpressions of a program modulo alpha-renaming

A comprehensive collection of Char-to-bytes text encodings

Haskell library with extra operations on binary words

CSS selector axes for XML DOM in Haskell