Discovered VCV Rack while reading the September 2020 issue of Electronic Musician whose theme was Modular Masterclass. The magazine contained several tutorials on modular synthesizers. The patches for VCV Rack are available for download from Electronic Musician Magazine.
VCV Rack is available as a free download from https://vcvrack.com. A large set of modules are provided in the free download. VCV’s business model is to provide a library of modules (from many developers) and charge for them.