StudioTether is described as 'free application to tether your camera to your Mac' and is an app in the Photos & Graphics category. There are three alternatives to StudioTether for Android and Mac. The best alternative is DSLR Controller. It's not free, so if you're looking for a free alternative, you could try LightroomTether or Remote Release.
DSLR Controller is the first and only app that allows you to fully control your Canon EOS DSLR from your Android device, with nothing more than a USB cable. No computer or laptop required, no root required, no Wi-Fi required.
Remote releasing is using a remote control to activate the shutter of the camera. This is to prevent shaking the camera, and is often used with bulb shots and/or tripods. This app is the little (free) brother of DSLR Controller.