I wouldn't really consider stack to be a great tool. There is Stackage which may be useful but the tool itself falls apart quickly when used to compile more than a single package executable.

That being said, one should have looked at these:

  - cabal Nix-style builds
  - ghicd for continuous type-checking
  - stylish-haskell for light code formatting
  - brittany for slightly more invasive code formatting
  - hlint for linting