Google Images - Google Images is a search service owned by Google that allows users to search the World Wide Web for image content.
Halide - A premium camera for your phone
SauceNAO - SauceNAO is a reverse image search engine.
Camera+ - With Camera+ you’re able to use your iPhone to shoot the best photos you possibly can.
Yandex.Images - search for images on the internet, search by image
SLOW SHUTTER CAM - SLOW SHUTTER CAM is an app presented in the market by Cogitap Software to take the photo capturing experience to a whole new level by taking photos after adjusting the shutter speed.