GIMP - GIMP is a multiplatform photo manipulation tool.
Collagerator - Create amazing photo collages in few mouse clicks. Ready for download for Mac OS X and Windows.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
TurboCollage - TurboCollage - photo collage editor software. Make collages, picture piles, picture grids, montages, and mosaics on your Mac or Windows PC. Download a free trial now!
ShapeX - Collage - Free Shape-Collage Generator! – (v1.1) Save Example Images & New Examples !
PhotoMix - Affordable photography in the Gatineau/Ottawa region!