What is "meteors"

Meteor, or Meteorjs, is a free open source isomorphic web framework written using Node.js. Meteor enables rapid prototyping and produces cross-platform codes (Android, iOS, Web). It integrates with Mongodb and uses the Distributed Data Protocol and a subscription publication standard to automatically propagate data changes to customers, without requiring the developer to write any synchronization code. At the customer, the Meteor can be used with its own Blaze modeling mechanism as well as with Angular or React structures.