LettuceMeet - The easiest way to schedule group meetings.
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
Clockwise for Slack - Tame the chaos of work
Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.
Meetingbird - Powerful meeting scheduling and notes — right in your calendar
myMail - myMail is the smart email app for managing all your accounts on iOS and Android.