Streak was born out of the frustration of constantly having to switch between our inbox and separate systems. Streak lets you keep track of all your deals right from your inbox. You can use Streak for Sales, Bug Tracking, Customer Support, Hiring and etc…

You can also schedule emails to send later. You can see a holistic view of your customers or deals. There is a spreadsheet view right inside Gmail to let you edit your deals fast and create easy reports. Streak never alters any data in your Gmail. No extra labels, and no moving around your messages. Streak adds a layer of organization on top of your email and stores this separately and securely in their own cloud.

Requirements: -
Demo: http://www.streak.com/
License: License Free