Voltage Modular is a free VST/AU virtual “modular case” for macOS and Windows compatible with most DAWs. It also runs as a Stand-Alone soft-synth.
Developers can freely design and publish modules with the equally free Voltage Modular Designer, and there’s a bunch of both free and paid modules available from a range of DYI as well as more established vendors.
The Cherry Audio Year Two Collection assembles all of our killer “high-end” modules from Voltage Modular’s second year including
and the brand-new Polymode synthesizer module, at a huge savings over the individual purchase prices.