once fyi - Create privacy friendly one-time mailing lists

Mailmeteor - Send hundreds of personalized emails with Gmail.

Best Referral Programs - A curated directory of startup referral programs

GMass - GMass allows you to easily schedule emails, send out mass emails and mail merge campaigns and more with Gmail! Click here to learn about more features!

Viral Loops for Startups - Virality for startups made easy 💪

Interseller - Interseller helps find contact information, reach out to them with email automation and syncs it all into your database.