CiviCRM is a web-based, open source, internationalized suite of software for constituency relationship management, that falls under the broad rubric of customer relationship management. Developed by CiviCRM
License: Open Source
CiviCRM is an open-source CRM solution ideal for non-profits and organizations looking for customization, while SalesSeek is a more user-friendly CRM focused on sales teams with strong automation and reporting capabilities.