Information Management System

Customer Relationship Management: SugarCRM
http://www.sugarcrm.com/
Open source CRM pioneer SugarCRM covers all the bases with installed, hosted, and appliance options. The software itself is ripe for small and medium businesses, highlighted by an AJAX mail client, good Office/Outlook integration, new performance dashboards, and the support of a strong developer community and a library of plug-ins.

Enterprise Resource Planning: Openbravo
http://www.openbravo.com/
A tad light onhttp://www.blogger.com/img/gl.link.gif HR, customer-to-Web, and document management, Openbravo handles procurement, product pricing, inventory management, production, financial accounting duties, and even sales and CRM with gusto. Its ability to handle multi-phase projects and partner relationships help set it apart.

Content Management: Alfresco Content Management
http://www.alfresco.com/
No longer strictly bound to its document-centric roots, Alfresco is a full-fledged enterprise content manager, covering document, records, and image management, with federated search capabilities. This kind of breadth often signals extra complexity in commercial offerings, but not in Alfresco. Ease of use and administration are both exceptional.