Adobe Photoshop - Adobe Photoshop is a webtop application for editing images and photos online.
GuideGuide - GuideGuide is the Photoshop and Illustrator panel that makes working with guides.
GIMP - GIMP is a multiplatform photo manipulation tool.
phpAlbum - phpAlbum.net is an Open Source PHP script which allows creating personal Photo Album / Gallery
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
Photoscape - high quality photo editing software, that enables you to fix and enhance photos.