PostgreSQL is a powerful, open source object-relational database system.It runs on all major operating systems, including Linux, UNIX (AIX, BSD, HP-UX, SGI IRIX, Mac OS X, Solaris, Tru64), and Windows.
Moodle is a Course Management System (CMS), also known as a Learning Management System (LMS) or a Virtual Learning Environment (VLE). It is a Free web application that educators can use to create effective online learning sites.
OrangeHRM aims to be the worldâ€™s leading open source HRM[human resource management] solution for small and medium sized enterprises (SMEs) by providing a flexible and easy to use HRM system affordable for any company worldwide.
Asterisk is software that turns an ordinary computer into a voice communications server. Asterisk is the world's most powerful and popular telephony development tool-kit. It is used by small businesses, large businesses, call centers, carriers and governments worldwide. Asterisk is open source and is available free to all under the terms of the GPL.
OpenNMS is an enterprise-grade network monitoring platform developed under the open source software model.It consists of a community supported open-source project as well as a commercial services, training, and support organization