Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
Manual Camera for iPhone - Custom exposure for your iPhone camera
Flickr - image and video hosting website
Snapseed - Snapseed is a photo enhancement and sharing app with a powerful suite of imaging filters and tools...
Photobucket - Photobucket offers image hosting and free photo and video sharing.
Pixlr - Pixlr® makes it easy to transform everyday images into stunning works of art.