More details: NetHunt
NetHunt is a Customer Relationship Management (CRM) system for Gmail and Google Apps. With its customizable structure, NetHunt can help you in organizing any business process or communication, including lead management, customer support, project management and other processes. Completed with a mass mailing and email tracking capabilities, NetHunt puts your client data to a good use, allowing you to contact hundreds of contacts with a single customizable bulk email. With full Google Apps integration, you can sync your data across other Google services (Calendar, Drive, Contacts) and use the Google Apps ecosystem to your advantage. NetHunt CRM is available as a Chrome Browser extension and the native Android and iOS apps.