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.
KidPass - Discover & book the best kids activities & online classes.
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
Yuggler - Fun activities for kids and family!
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.