git-annex is Free Software.
The majority of git-annex is licensed under the GPL, version 3 or higher.
The git-annex webapp is licensed under the AGPL, version 3 or higher. Note that builds of git-annex that include the webapp may be licensed under the AGPL as a whole. git-annex built without the webapp does not include this code, so remains GPLed.
git-annex contains a variety of other code, artwork, etc copyright by others, under a variety of licences, including the BSD, MIT, and Apache 2.0 licenses. For details, see this file.