Trigraphy - Photo editing app that allows you to make mosaic/abstract looking art.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Dreamscope - Make and share 'deep dream' images using dozens of supplied styles or your own.
Invision - Prototyping and collaboration for design teams
Photomosh - Turn anything into a vaporwave
Sketch - Professional digital design for Mac.