Gmail Mail Merge - Send personalized emails with attachments
Mailtrack.io - The best email tracking solution I've found. Free
Inbox Grader by Freshworks - Free metrics 📈 for your business and team email ✉️
Unlimited Email Tracker - Track opens and clicks, set reminders and delays in Gmail
Dynamic Campaigns by Sigstr - Share the most relevant content in every email
MailTracker - MailTracker is a mobile email tracking solution.