Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Great Wallpapers For iPad - Great Wallpapers is an all-in-one iPad application that comes with high-quality images from a plethora of categories.
Invision - Prototyping and collaboration for design teams
Audiko - Audiko Ringtones is a free to use mobile application that can help you customize your mobile phone by setting the most beautiful images your background and the most popular ringtones as your notification signals.
Sketch - Professional digital design for Mac.
Peppy Wallpapers - New free wall app with some lovely minimalist designs.