PicsArt - Explore 100,000,000+ awesome images and photos on the web
PixBuilder - Free Photo Editing Software for PC
Camera360 - Let those photos out of their albums and PK with Camera360 users worldwide!
PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Pixelmator - Pixelmator is an image-editing application for Mac and iPad.
Fotografix - In addition to being totally portable, Fotografix has a ridiculously small footprint.