Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
GIMP - GIMP is a multiplatform photo manipulation tool.
Percolator - Percolator: the always fun, supremely unique photo app that is sure to surprise you! FEATURES:
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.