Act! (previously known as Sage ACT! 2010-2013) 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, Excel, Outlook, Google Contacts, Gmail and other popular applications in order to generate and track communications with the contacts maintained in ACT!. It is developed by Swiftpage and has a user base of over 2.8 million registered users.According to 2013 CRM Switch survey, Act! is currently the 5th most popular CRM software application amongst US Businesses, and 4th most popular amongst companies with less than 100 employees.