Cassandra is a NoSQL database which is distributed and scalable. It is provided by Apache.
CouchDB is an open source NoSQL database developed by Apache software foundation. It is written in Erlang programming language.
DB2 is a database server developed by IBM. It is a Relational Database Management System which is designed to store, analyze and retrieve the data efficiently.
Learn how to use the world's most popular open source database management system.
Neo4j is a graph database management system. It is ideal for storing relational/connected data.
Learn SQL Server, starting with the basics. Create a database, tables, relationship, and more.