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

Gumroad - An all-in-one solution to sell your work and grow your audience.

Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Flurly - The easiest and most affordable way to sell digital products online

Newton Mail - Newton is a fully featured mail client available for Android, iOS, macOS and Windows.

Streak - Manage customers inside Gmail