fast-tags makes vi (and now emacs) tags from haskell source. It does so quickly and incrementally. I have it bound to vim's BufWrite to keep tags always updated, and it's basically instant. It works with hsc, literate haskell, and mid-edit files with syntax errors. I've announced this before, but I'm doing it again because it's been a long time and there was a major update. I bumped to 1.0 to reflect that it's not dead, it just does everything I need it to do, so further development is unlikely unless someone finds a bug. That's just for me of course, if someone else wants to add features they are welcome to do so. The major update was almost entirely thanks to Sergey Vinokurov and a few others who contributed a bunch of patches. Details and changelog are at http://hackage.haskell.org/package/fast-tags-1.0 Source is at https://github.com/elaforge/fast-tags