Someone from FotoJet contacted me, so I checked this tool.
It is a free online collage maker that helps users turn your photos into amazing collages and then quickly share with family and friends via Facebook, Twitter, Pinterest or Tumblr, providing 900+ creative collage templates and 80+ classic collage layouts. It works perfectly in any browser without the hassles of downloading! The page is https://www.fotojet.com/.
This web tool is free. There are also some paid product created by the same company. You can see more at: http://www.pearlmountainsoft.com/