Snailbox - Schedule your email at specific times and recover the time you're losing to your inbox.
Gmail Focus - A Chrome extension to focus on your email
Minutemailer - Email Marketing. Simplified.
Rofocus Chrome Extension - Increase your focus and productivity with ambient sounds
MailerLite - Affordable Email Marketing Software. Get all features (Segmentation, Automation, A/B testing) for up to 1,000 subscribers & send unlimited emails for free!
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.