Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
Faviconer - Faviconer.com, or favicon generator, is online tool for creating favicon.
GIMP - GIMP is a multiplatform photo manipulation tool.
ConvertIcon! - Converticon is a simple icon utility.
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Ordinatore - Those who want to tidy up their Macs will surely love this application.