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
Gmail Mail Merge - Send personalized emails with attachments
TL;DR Email - Send short emails & read emails as fast as you read Facebook
Inbox Grader by Freshworks - Free metrics 📈 for your business and team email ✉️
mlist - Email newsletters, outside of the inbox
Dynamic Campaigns by Sigstr - Share the most relevant content in every email