MongoDB is a source-available cross-platform document-oriented database program. MongoDB uses JSON-like documents with optional schemas as it is classified as a NoSQL database program
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Rabbitmq is an open-source message-broker software (also called message-oriented middleware) which implemented the Advanced Message Queuing Protocol and was extended with a plug-in architecture to support Streaming Text Oriented Messaging Protocol, MQ Telemetry Transport, and other protocols. Server program is written in the Erlang programming language and is built on the Open Telecom Platform framework for clustering and failover. Broker interface with cleint libraries are available for all leading programming languages
PostgreSQL (also known as Postgres), is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance. PostgreSQL features transactions with (ACID) properties - Atomicity, Consistency, Isolation, Durability, automatically updatable views, materialized views, triggers, foreign keys, and stored procedures. It is designed to handle a wide range of jobs, from single machines to data warehouses or Web services with many concurrent users.