Icons8 Background Remover - Quickly remove the background from any photo
digiKam - Professional Photo Management with the Power of Open Source
remove.bg - Remove the background of any image 100% automatically
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!
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.