Mailspring - Mailspring is a mail client for Mac, Windows and Linux.

Natural Atlas - An evolving, nationwide map of the outdoors

Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Bigbee - Connect with anyone, anywhere.

The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.

The Nudge - A planner friend in your pocket.