Topicbox - Put team emails into one centralized, searchable place
TL;DR Email - Send short emails & read emails as fast as you read Facebook
InboxSDK - First usable API to write Gmail Apps for 1B active users
Spark Mail - Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Inbox Grader by Freshworks - Free metrics 📈 for your business and team email ✉️
mlist - Email newsletters, outside of the inbox