I’ve been a big fan of Git Extensions since I started using it around a year ago. When I moved to Visual Studio 2013 I admit to missing it (and not being a fan of the VS built-in GIT support).
Thankfully, Git Extensions version 2.47.3 has been released which offers support for VS2013! Hurray! On top of that it also fixes an annoying problem with the credential helper.
The latest version of Git Extensions can be found here.