Topicbox - Put team emails into one centralized, searchable place
Ecommerce Senders - Live email marketing insights for the top 100 Shopify stores
InboxSDK - First usable API to write Gmail Apps for 1B active users
BiggerCake - The data tool that Kickstarter deserves
Front - multi-channel inbox service for collaborative teams
Email Insights - Email Insights - Analytics for Marketers