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