Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Photostage - Quickly and easily combine photos and videos with a narration or soundtrack using PhotoStage slideshow software. Free slideshow maker download for Mac & PC.
Geary - Geary is an email application built for GNOME 3.
ProShow - ProShow is a dedicated tool for creating slide shows from your photos, video and music.
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.
SmartSHOW 3D - SmartSHOW 3D is pro-level slideshow software with a powerful 3D animation engine.