Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Olivia - Your new best friend built with an artificial neural network
Geary - Geary is an email application built for GNOME 3.
Digit - SMS bot that monitors your bank account & saves you money
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.
Spendee - See where your money goes