Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
Winnie - Great activities and destinations for families
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
KidPass - Discover & book the best kids activities & online classes.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
SparkStudio - Online extracurricular classes for 5-15 year olds