ClippingMagic.com - Remove image backgrounds online. Make backgrounds transparent, white, etc. Edit, crop, rotate, fix colors, add shadows, all you need for great photos!
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Bg Eraser - Background Eraser on Mac and Windows.
GIMP - GIMP is a multiplatform photo manipulation tool.
eTinysoft Photo Eraser - Photo Eraser for Mac, Iphone, Ipad is an easy-to-use photo editor to remove watermarks ,date stamps, text, building or anything else from photos.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.