Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Penny - Penny is a personal finance app that takes the pain out of keeping track of your finances.
Geary - Geary is an email application built for GNOME 3.
PCRecruiter - PCRecruiter is a powerful, flexible, affordable web-based system for recruiting, sourcing, and placement professionals of any business size.
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.
Appreiz - Employee engagement and social recognition platform