CiviCRM (en)

CiviCRM is a powerful web-based relationship management system. It allows you to record and manage information about the various people and organizations that are important to your organisation. CiviCRM is more than just an address book It also allows you to track your interactions with those people and organisations and to get them to engage with, and potentially give money to, your organisation through your website. The information you gather is all stored in one place but you can access it from almost anywhere.