Smart Compose in Gmail - Write emails faster with Smart Compose in Gmail
HTMLEmail.io - Responsive HTML email templates for startups & developers
EasyEmail - Gmail plug-in that helps you write emails quickly
Startup Emails - Responsive HTML email templates for startups
Missive - Team communication app now supporting FB, Twitter & SMS
Stripo - Stripo is an all-in-one email design platform. We enable our clients to build emails of any complexity, including interactive AMP emails, really fast and easy.