FastSnap is described as 'Use the Volume buttons to capture a photo or video both inside and outside the Camera application' and is an app in the Video & Movies category. There are more than 10 alternatives to FastSnap for a variety of platforms, including iPhone, Android, iPad, Android Tablet and Windows. The best alternative is Open Camera, which is both free and Open Source. Other great apps like FastSnap are Simple Camera (Free, Open Source), FreeDCam (Free, Open Source), Camera+ (Paid) and Camera FV-5 (Paid).
A simple camera with zooming, capable of taking photos and recording videos, with customizable save folder. The resolutions can be limited by mpx, aspect ratio can be set too. Provides a nice and clean UI.
Substitute for the default Camera with enhanced shot, exposure, and image options. FreeDCam is an open source camera app which tries to enable stuff that is forgotten by the manufacturers. It grants access to deep internals of Android camera APIs.
The built-in camera app for the iPhone. Get the perfect picture with the advanced pixel technology in your iPhone, iPad, and iPod touch. All you have to do is find something beautiful, open the Camera app, and tap the Shutter button.
Activator lets you open or "activate" apps on your jailbroken iPhone via special gestures, buttons and shortcuts, instead of requiring you to return to the homescreen and tapping on an icon every time.