PhotoDemon - Lightweight portable BSD licensed photo editor for Windows focused on performance and usability.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.
PhotoFlare - Quick, simple but powerful Cross Platform image editor.
Adobe Photoshop Express - Easily edit and share your photos in no time!
PixBuilder - Free Photo Editing Software for PC
PicsArt - Explore 100,000,000+ awesome images and photos on the web