gitfs : gitfs is a FUSE file system that fully integrates with git. You can mount a remote repository’s branch locally, and any subsequent changes made to the...
BlackBox : Safely store secrets in a VCS repo (i.e. Git, Mercurial, Subversion or Perforce).
Git Extensions is the only graphical user interface for Git that allows you control Git without using the commandline. It comes with a manual and video tutorials to get you started quickly.