Apps similar to Shutter - Camera Remote Control include digiCamControl, which is free and open source. Other options are qDslrDashboard, qStopMotion, CaptureGRID and Entangle. You can choose from more than 10 apps like Shutter - Camera Remote Control for Linux, Mac, Windows, Android and iPad.
Camote allows remote control of modern Sony cameras that have WiFi. In principle, all cameras should work that are compatible with the Sony PlayMemories app. Currently I can only test with the Sony Alpha 6300 and Sony Alpha 7 III.
LightroomTether is a free plugin for Adobe Lightroom v2 which automates the running and configuration of StudioTether.
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.
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