Is your nonprofit working with multiple systems to accomplish your tasks? Do you have one system for newsletters, another for events, and a database for donors? Or maybe your existing constituent relationship management (CRM) system just isn't doing the job?
What do the Electronic Frontier Foundation, Wikimedia Foundation, Free Software Foundation, Creative Commons, Drupal Association, and Leukaemia & Lymphoma Research have in common? They all use CiviCRM to help further their missions.
In case you haven't heard of CiviCRM, it is the leading open source CRM for non profit organisations - providing integrated tools for constituent tracking, fund-raising, event registration, case management and e-newsletter (and has out of the box integration with Drupal, Joomla and WordPress).