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Winnie - Great activities and destinations for families
Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
Sawyer - Discover a wonder-filled world of kids classes, camps, events, and activities, right in your neighborhood
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
SparkStudio - Online extracurricular classes for 5-15 year olds
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.