This is a todo list management application, written in Rails 4 and AngularJS. Tasks support CRUD operations as well as drag&drop sorting and setting due dates via a popup calendar. All task operations are done on the client side and synchronized to the server. The application sports a RESTful API used by AngularJS SPA and also usable standalone.
Check out the demo at todo-rails4-angularjs.
I wrote an article that summarizes all the lessons learned during writing of this app. I also did a presentation about this integration at Ruby User Group in Sopot on September 18th. Check out the slides.