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
Nova Inbox - Personalize emails in seconds, right from your inbox
mlist - Email newsletters, outside of the inbox
Tropical.io - Connect your CRM and other sources (Mailchimp, Unbounce, GoToWebinar, Uservoice, and more) and we tell you which leads are hot