Download and Open Camera is a full-featured and completely free camera app for Android phones and tablets.
Pros:
Options to auto-stabilize so that your image is perfectly level no matter what (see example image).
Exposure of your camera function: support for focus mode, scene mode, color effect, white balance, ISO, exposure / lock compensation, face detection, torch, antibanding.
Video recording (including HD, taking photos when recording video, time lapse).
