bergey has developed an emacs mode for browsing git-annex repositories, dired style.

Locally available files are colored differently, and pressing g runs git annex get on the file at point.

John Wiegley has developed a brand new git-annex interaction mode for Emacs, which aims to integrate with the standard facilities (C-x C-q, M-x dired, etc) rather than invent its own interface.

He has also added support to org-attach; if org-attach-git-annex-cutoff is non-nil and smaller than the size of the file you're attaching then org-attach will git annex add the file; otherwise it will git add it.

magit-annex adds git annex operations to Magit.