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SugarCRM allows you to do this easily. SugarCRM allows you to track Prospects, leads and contacts. If you have a potential customer you can easily convert your lead into a contact. Also, you can easily create and integrate a web-lead capture form using SugarCRM. http://www.sugarcrm.com/feature/marketing-automation and http://www.sugarcrm.com/feature/sales-force-automation