Nebulosity is described as 'is designed to be a powerful, but simple to use capture and processing application for Windows (7/8/10 32/64 bit) and OS X (10.7-14)' and is an app in the Education & Reference category. There are more than 10 alternatives to Nebulosity for Windows, Linux, Mac, iPhone and Raspberry Pi. The best alternative is SbigControl. It's not free, so if you're looking for a free alternative, you could try Qastrocam or N.I.N.A.. Other great apps like Nebulosity are Sequence Generator Pro (Paid), Voyager Astrophotography (Paid), BackyardEOS (Paid) and SharpCap (Free).
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.