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Dolibarr ERP/CRM is an open source/free software for small and medium companies, foundations or freelances. It includes different features for Enterprise Resource Planning (ERP) and Customer Relationship Management (CRM) but also other features for different activities.
vtiger CRM project provides an easy to install, industrial-strength, business-ready open source CRM. It provides rich UI, reports, multiple database-type support,sales-management,inventory-management,etc. Demo available.
Free yourself from expensive commercial ERP software, diffficult to maintain legacy applications, and messy integration projects. opentaps is a complete open source platform for your enterprise. Its sophisticated features and modern architecture includes a full ERP and CRM solution plus mobile connectivity and built-in business intelligence tools.