Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
PainScale - Find treatments for your chronic pain
Mutt - Mutt is a small but very powerful text-based mail client for Unix operating systems.
Hello Heart - Easily monitor and understand your blood pressure
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
BodyBarista - Measure your body with only your iPhone and a mirror 💪☕