MySQL - The world's most popular open source database
Apache Camel - Apache Camel is a versatile open-source integration framework based on known enterprise integration patterns.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
Azure Service Bus - Learn how to set up messaging that connects applications and services across on-premises and cloud environments. Tutorials, videos, API references, and more.
SQLite - SQLite Home Page
Software AG webMethods - Software AG’s webMethods enables you to quickly integrate systems, partners, data, devices and SaaS applications