Personal CRM. Remember everything about your friends, family, etc.
The most affordable CRM system according to Capterra
IGSuite is a web-ajax-based Integrated Groupware Suite
software for email automation (newsletters, transaction mails, etc.)
A simple address and contact management PHP script
Web-based open source CRM by Webworks Nürnberg
Small utility to enable trace on demand for Siebel CRM.
Rails CRM is an opensource Customer Relations Management application.