Polymail - Native email app for email productivity.

Gone - An ephemeral to-do list

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

Streaks - The to-do list that helps you form good habits.

Airmail - Airmail is a lightweight and lightning fast mail client for Mac.

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.