I do actually use or have used graphic software made by Pearlmountain, including Publisher Plus for Mac [… a Desktop Publishing (DTP) software you can use to design and create professional quality flyers, brochures, posters and business cards], Picture Collage
Picture Collage Maker
Picture Collage Maker for Mac “Picture Collage Maker for Mac is a powerful yet easy-to-use collage maker that helps turn your ordinary photos into stunning collages, scrapbooks, posters, greeting cards and more.” We did not take their word for it