Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Tag That Photo - Your Photos in Your Control by Tag That Photo Software. Face Recognition, Privacy, Tagging and more.
GIMP - GIMP is a multiplatform photo manipulation tool.
digiKam - Professional Photo Management with the Power of Open Source
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
XnView MP - XnView is a free software that allows you to view, resize and edit your images. It supports more than 500 different formats!