Database

HSQLDB (HyperSQL DataBase) is the leading SQL relational database system written in Java. It offers a small fast multithreaded and transactional database engine with in-memory and disk-based tables and supports embedded and server modes.

Microsoft SQL Server is a relational database management system or RDBMS that supports a wide variety of transaction processing business intelligence and analytics applications in corporate IT environments.

MongoDB is a source-available cross-platform document-oriented database program. Classified as a NoSQL database product MongoDB utilizes JSON-like documents with optional schemas. MongoDB is developed by MongoDB Inc. and current versions are licensed under the Server Side Public License.

MySQL is an Oracle-backed open source relational database management system (RDBMS) based on Structured Query Language (SQL). MySQL runs on virtually all platforms including Linux UNIX and Windows.

Oracle Database is an advanced relational database management system developed and marketed by Oracle sometimes referred to as Oracle RDBMS Oracle relational database management system or simply Oracle.

PostgreSQL is a database management system that uses the relational model for databases and supports the SQL standard query language. PostgreSQL is also a Database Management System with good performance secure and wide-ranging features.

SQLite is a C-language library that implements a small fast self-contained high-reliability full-featured SQL database engine. SQLite is the most used database engine in the world. SQLite is built into all mobile phones and most computers and comes bundled inside countless other applications that people use every day.