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Vtiger CRM is a free CRM software ideal for small and medium businesses, with low-cost product support available to production users that need reliable support.

PhpWiki: a PHP WikiWikiWeb

Vanilla Forums are open-source, standards-compliant, customizable discussion forums.

phpwcms is a robust and simple but yet powerful web based content management system

phpSupport is your customer friendly trouble ticket system

TYPO3 is a free Open Source content management system for enterprise purposes

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Trellis Desk is a powerful and robust help desk solution for your business.

phpScheduleIt is an Open Source web-based reservation and scheduling system