Gmail Mail Merge - Send personalized emails with attachments
Topicbox - Put team emails into one centralized, searchable place
Dynamic Campaigns by Sigstr - Share the most relevant content in every email
InboxSDK - First usable API to write Gmail Apps for 1B active users
Dynamically Personalized Emails by QGraph - Hyper-personalized emails for E-commerce
Front - multi-channel inbox service for collaborative teams