Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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
FairEmail - Open source, privacy friendly email app
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
K-9 Mail - K-9 is an opensource email client making it easy to chew through large volumes of email.
Gumroad - An all-in-one solution to sell your work and grow your audience.