GIMP - GIMP is a multiplatform photo manipulation tool.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Fotor - Fotor is an all in one visual platform. It includes photo editor, collage maker, and graphic designer. You are free to make a visual look more beautiful.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.