MongoDB Atlas`, a database as a service for MongoDB, has been updated with a new free tier and live migration tool called `MongoMirror`. The new "M0" cluster type is a free cluster ideal for learning or building prototypes. MongoMirror automates the process of migrating data from existing MongoDB 3.0+ replica sets to MongoDB Atlas, making it easier to migrate applications without downtime. These updates aim to make it even easier for developers to get started with MongoDB Atlas and execute their ideas seamlessly. The company plans to expand MongoDB Atlas to other cloud platforms in the coming months.