chaosMachine - One-click unique graphics generator
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
Kandinsky.io - Abstract image generator
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.
IsometricSass - Make isometric 2D objects without Javascript
Mosaic Creator - Mosaic Creator is professional mosaic tool. You can create your own picture mosaic.