In an article for GigaOM, Charles Jade provides a rundown of seven camera apps for the iPhone. They’re a varied bunch, but most of them function a replacements for Apple’s built-in Camera app. You can use these apps, such as Camera+, Photoshop Express, and Best Camera, for everything from taking simple snapshots to cropping images to applying fun and retro filters. As Jade noted:
Most apps had more photo-capturing functionality than Apple’s Camera app, but not all had video. All apps but Camera had editing tools, and most had more sharing options than Apple’s own offering, but the best camera app is built around capturing, editing, and sharing as a unified process.