Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
Percolator - Percolator: the always fun, supremely unique photo app that is sure to surprise you! FEATURES:
Pixel Studio - The Pixel Art Is Always Fun
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS
Repix by Sumoing Ltd - Mosaic paint filters, bokeh effects, and more