Photomosh - Turn anything into a vaporwave
AndreaMosaic - With AndreaMosaic you can create your own photographic mosaics made with your own pictures.
HearSeeParty - Combine Gifs with with music using tags
WidsMob Montage - Make stunning mosaic photos or montage shape with tiles, which supports both JPEG and PNG files.
Decim8 - Turn photographs into glitch art
Mosaic Creator - Mosaic Creator is professional mosaic tool. You can create your own picture mosaic.