BackyardEOS is described as 'is software tailor made to control your Canon DSLR camera. It is purposely built with astro-photography in mind' and is an app in the Education & Reference category. There are more than 10 alternatives to BackyardEOS for Windows, Mac, Linux, iPhone and Raspberry Pi. The best alternative is Nebulosity. It's not free, so if you're looking for a free alternative, you could try FireCapture or Qastrocam. Other great apps like BackyardEOS are SbigControl (Paid), Voyager Astrophotography (Paid), AstroImager (Paid) and N.I.N.A. (Free, Open Source).
Qastrocam is a capture program to do astrophotography. It can control a telescope to do guiding with the images received from a V4L device. It can also control the extended features of a webcam modified to do long exposure (several seconds) captures.