Meteor is an amazing framework that makes it really easy to build real time web applications with simple web technologies like Java script and HTML.
Using Meteor, you write code that runs both on the client and on the server, and you can even turn your web app into a mobile application by using Cordova behind the scenes. This framework is reactive, meaning that any change to your data is automatically reflected everywhere throughout the app without the need for callbacks.
You can save a lot of time with smart packages. Explore Meteor Packages at https://atmospherejs.com/
Meteor provides its own free hosting service for quickly deploying small apps and prototypes.
I started developing with meteor and I found it quick and easy to learn as well as to develop the applications. Have a look at my meteor app Tutorial Hunt
Take a look at the Best Learning Resources for Meteor.js