Smart Compose in Gmail - Write emails faster with Smart Compose in Gmail
Email Inspire - Discover the best of email design and marketing — Browse email newsletters from top brands.
Text Case - Format any raw text on iOS and more 📝
EmailWay - Collection of the most insightful and informative email newsletters from across a wide spectrum of industries and interests
EasyEmail - Gmail plug-in that helps you write emails quickly
Really Good Emails - A large collection of good product email design.