High Quality Content by WIKIPEDIA articles! Sage ACT! (earlier known as ACT! by Sage) is a customer relationship management (CRM) software application which is used to keep track of client and prospect details in a single database that can be shared by multiple users. It integrates with Microsoft Word, Microsoft Excel, Outlook, and other popular applications in order to generate and track communications with the contacts maintained in Sage ACT!. It is distributed by Sage and has a user base of over 2.8 million registered users.