DrasticScope is a suite of software products for signal analysis. There is a free version, great for training and signal validation purposes, including low budget and no budget video workflows. There are also paid versions available for more fully featured workflows, including SDI/HDMI analysis, HDR/WCG workflows, and ST-2110/IP stream analysis.
We have recently added a number of professional scopes to the suite that you would expect to see only on far more expensive hardware based signal analysis devices, such as the Channel Plot, YCbCr Vector, Y/C Peak, Luma Peak, and 6 Bar Gamut scopes.