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Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Winnie - Great activities and destinations for families
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Sawyer - Discover a wonder-filled world of kids classes, camps, events, and activities, right in your neighborhood
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.
SparkStudio - Online extracurricular classes for 5-15 year olds