A free app for Android, by LektorHansen.

DSLR Camera Remote Control app lets you remote control and trigger your compatible Canon or Nikon DSLR camera from your phone or tablet with a tethered USB OTG (USB HOST) cable.

This application works with your phone or tablet and the camera to give you the ability to control settings such as shutter speed, aperture, and ISO. You can also control settings such as white balance, picture style, and metering mode. You can also see live view of the camera settings on your phone or tablet.

This application also includes a focus stacking assistant and a light meter tool.

This application is available on the Google Play Store.