git-annex.app

For easy installation, use the prebuilt app bundle.

To run the git-annex assistant, just install the app, look for the icon, and start it up.

To use git-annex at the command line, you can add git-annex.app/Contents/MacOS to your PATH

Alternatively, from the command line you can run git-annex.app/Contents/MacOS/runshell, which makes your shell use all the programs bundled inside the app, including not just git-annex, but git, and several more. Handy if you don't otherwise have git installed.

autobuilds

An autobuild is also available, thanks to the Datalad project.

download security

All the download links above use https for security. For added security, see verifying downloads.

using Homebrew

git-annex is available in Homebrew.

using MacPorts

git-annex is not available in MacPorts, but can be built from source using MacPorts tools. See MacPorts.

building it yourself

See porting.