CiviCRM
CiviCRM is an open source CRM software for non-profit organizations that centralizes, builds, and engages your constituents. It has been used by over 18,000 non-profits. With CiviCRM, you can centralize constituent communications, build and manage your donor base, and engage stakeholders. CiviCRM users have collectively registered over 24 million participants in events and processed over $116 million in donations. With CiviCRM, you get to choose your host, whether it's one of CiviCRM's expert partners or your own infrastructure. One of CiviCRM's long-time contributors Eileen McNaughton won the New Zealand Open Source Award for Open Source Contributor. CiviCRM is fully customizable and expandable. It can be integrated into Wordpress, Joomla, and Drupal too. Contact management, accounting integration, membership management, advocacy campaigns, and event management are some of the great features you can use in CiviCRM. You can create and manage email lists with CiviCRM as well. The software provides reports that you can use to evaluate your organization's progress.