Minimize Email - Anonymously tell coworkers when they send too many emails 🙊

Right Inbox - Schedule Emails in Gmail To Be Sent Later

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

Recurrr - Send recurring emails

MailTime - Go through your email as fast and easy as text-messaging

FollowUpThen - The simplest way to schedule an email reminder