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
Meetingbird for Gmail - View your calendar and schedule meetings right from Gmail
Polymail - Native email app for email productivity.
Kin Calendar - The simple and connected calendar
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Calendly for Chrome - Schedule meetings without leaving your inbox