Trigraphy - Photo editing app that allows you to make mosaic/abstract looking art.
match.color.io - Automatically match colors of any image or movie with ML
GIF Brewery by Gfycat - Create stunning GIFs from videos & screen recording for free
Color Palette Generator - Enter the URL of an image and find its color palette
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.
Swatches - A fun and accurate color picker for the real world