A free program for Android, by SuperOffice.

This app is a tool that helps you to keep track of your customers, contacts, leads, opportunities, and events. It’s a complete customer relationship management (CRM) system that will allow you to make informed decisions about how to best engage with them, as well as see your productivity peak. You can schedule or reschedule meetings and activities, communicate with colleagues or save new information, all while being on the go.

CRM is the most important thing for any business to be successful. You need to have a CRM in order to keep track of all your customers, leads, and contacts, and see your productivity peak. This app will help you to do just that.