Open Office
It is a multi platform and multi lingual office suite and an open-source p
Open Office
It is a multi platform and multi lingual office suite and an open-source project. Compatible with all other major office suites, the product is free to download, use, and distribute
PostgresSQL
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.
Drupal
An open source content management platform. Equipped with a powerful blend of features, Drupal supports a variety of websites ranging from personal weblogs to large community-driven websites.
Moodle
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.
Orange HRM
OrangeHRM aims to be the world’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 [VoIP]
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
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
Adempiere [ERP]
ADempiere is a commons-based peer-production of Open Source ERP 
Applications.
