Augin - Augin is an augmented reality platform to create, publish and view augmented reality apps.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
wisaw - What I Saw Today (cool things) -- Minimalistic Anonymous Photo Sharing
Geary - Geary is an email application built for GNOME 3.
Drop Messages - Drop Messages is an all-in-one application that lets you send private photos to your friends.
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.