This project uses Git to manage its source code. Instructions on Git use can be found at http://git-scm.com/documentation.
The source can be checked out anonymously from Git with this command (See http://git-scm.com/docs/git-clone):
$ git clone --branch findbugs-annotations-3.0.1-1 git://github.com/stephenc/findbugs-annotations.git
Only project developers can access the Git tree via this method (See http://git-scm.com/docs/git-clone).
$ git clone --branch findbugs-annotations-3.0.1-1 git@github.com:stephenc/findbugs-annotations.git