PhotoSpills - Easy to use PC collage software with unlimited design possibilities.
Trigraphy - Photo editing app that allows you to make mosaic/abstract looking art.
CollageIt - CollageIt is an easy-to-use and automatic collage maker, which makes photo collage automatically.
Photomosh - Turn anything into a vaporwave
Snap2IMG - Snap2IMG generates contact sheets (also known as thumbnail sheets or image index) for folders on...
Dreamscope - Make and share 'deep dream' images using dozens of supplied styles or your own.