Newsletter Operating System - All-in-one dashboard to launch & grow your newsletter
Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail
Letterfuel - Grow your audience with a curated newsletter
Newsletter Bootcamp - Learn how to start and grow your newsletter in seven days
Mailtrack.io - The best email tracking solution I've found. Free
pollinate - You can now grow your newsletter using Twitter’s embedded signup functionality without sending it from Revue.