Amazon DynamoDB is described as 'Fully managed NoSQL database service offered by Amazon.com as part of the Amazon Web Services portfolio. It was announced by Amazon CTO Werner Vogels on January 18, 2012.OverviewDynamoDB differs from other Amazon services by allowing developers to purchase a' and is an app in the business & commerce category. There are more than 50 alternatives to Amazon DynamoDB for a variety of platforms, including Linux, Mac, Windows, Self-Hosted and Web-based apps. The best Amazon DynamoDB alternative is PostgreSQL, which is both free and Open Source. Other great apps like Amazon DynamoDB are MongoDB, MariaDB, Redis and CouchDB.