Topicbox - Put team emails into one centralized, searchable place
Gmail Mail Merge - Send personalized emails with attachments
InboxSDK - First usable API to write Gmail Apps for 1B active users
Nova Inbox - Personalize emails in seconds, right from your inbox
Front - multi-channel inbox service for collaborative teams
Tropical.io - Connect your CRM and other sources (Mailchimp, Unbounce, GoToWebinar, Uservoice, and more) and we tell you which leads are hot