Pixpie - Optimize your images and speed up your site on WordPress
remove.bg - Remove the background of any image 100% automatically
Website Image Speed Test - Beautiful & easy free analysis of the images on your page
ClippingMagic.com - Remove image backgrounds online. Make backgrounds transparent, white, etc. Edit, crop, rotate, fix colors, add shadows, all you need for great photos!
OptimizeWP - WordPress speed optimization and maintenance service
Bg Eraser - Background Eraser on Mac and Windows.