GIMP - GIMP is a multiplatform photo manipulation tool.
Sketch - Professional digital design for Mac.
Capture One Pro - The professionals’ choice in RAW image editing software with support for more than 500 cameras. Get started with Capture One today with a 30-day free trial.
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.