Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Icons8 Background Remover - Quickly remove the background from any photo
GIMP - GIMP is a multiplatform photo manipulation tool.
IMG.LY - Power Your Apps with IMG.LY | The Leading Provider of Design, Photo, and Video Editing SDKs
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
ClippingMagic.com - Remove image backgrounds online. Make backgrounds transparent, white, etc. Edit, crop, rotate, fix colors, add shadows, all you need for great photos!