Parse.com is or was an online Mongo database service and API for web applications. Parse provided a nice GUI complete for managing the data complete with Class Level Permissions which made it very easy to get user role permission based application up and running. Not to mention that they provided their own API libraries for Javascript, PHP, Android and IOS. It provided a REST API or you could just use one of ther API libraries to connect and transfer data. I used it developing a real estate search application for web and mobile. 

Founded in 2011, Facebook purchased Parse.com in 2013 for $85 million and recently announced that it will be shut down in January 28 2017. Thanks Facebook. I guess they just wanted to keep it all to them selves. Well not necessarily. Parse has been porting the server and other components to git hub and now it os open source so all the existing customers can continue running the Parse framework on their own servers. I personally love the GUI for managing the database. It very useful.