PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
MySQL - The world's most popular open source database
SQLite - SQLite Home Page
MariaDB - An enhanced, drop-in replacement for MySQL
Oracle Database 12c - Simplify database management and automate the information lifecycle with maximum security.
SAP HANA - SAP HANA is an in-memory, column-oriented, relational database management system.