Some additional repos to consider:
MongoDB-PHP7-Tutorial — A small example of a blog using MongoDB with PHP7. It has no authentication, only posts and comments. It is focused on learning to use MongoDB with PHP7.
CI_MongoDB — An Example of Integration between Codeigniter Framwork with MongoDB Database
symfony2-dual-auth — Example Symfony 2.1 app with FOSUserBundle and FOSFacebookBundle dual/simultaneous auth. Uses MongoDB.
Once a week...... I send out a list of most interesting PHP libraries and apps.
Want to get it?