Streak
Streak is a simple CRM application that works directly inside Gmail. With Streak, users can run their business from their Gmail inbox. Streak allows users to collaborate with a single click, simplifying sharing files, email and contacts. Because of Streak's lightweight nature, integration is a snap--no IT department required. And since it's designed to work directly inside Gmail, Streak integrates seamlessly with other Google Apps. Streak was conceived out of a desire for simplicity and to eliminate the need to switch between email and other external apps. Based in San Francisco, Streak is currently trusted by Uber, Twitter, Dropbox and Yelp.