Joomla - A free and open source CMS or content management system for publishing content on the World Wide Web and intranets.

Zimbra - Combines email, calendar and address book tools in an integrated system, an alternative to Microsoft Exchange/Outlook

Wordpress - WordPress is an open source blog tool and publishing platform powered by PHP and MySQL. It is often customized into a content management system

Piwik - Aims to be an open source alternative to Google Analytics.

Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.

Proxmox - Proxmox Virtual Environment is an easy to use Open Source virtualization platform for running Virtual Appliances and Virtual Machines.