GIMP - GIMP is a multiplatform photo manipulation tool.
IrfanView - IrfanView ... one of the most popular viewers worldwide.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Retrobatch - Retrobatch is a unique application for automating actions to tens, hundreds, and even thousands of images at the same time
ShapeX - Collage - Free Shape-Collage Generator! – (v1.1) Save Example Images & New Examples !
ImageGlass - You can use Image to view your digital images and photos of many different formats.