https://github.com/AuburnSounds/Dplug
As the main author I believe it has a relatively low cost-of-ownership that allows you to focus on building products.
Indeed Dplug has a commitment to stability through SemVer.
This framework supports both 32-bit and 64-bit, Windows/Mac/Linux, VST2/VST3/AUv2/AAX/LV2 (though to support Mac 32-bit you will need an older Xcode version).
Dplug has been continuously built and improved since 2015, this year we supports two new plug-in formats (in large parts thanks to contributions), and added automated installer generation for Windows and Mac.
If you are a commercial vendor (or aspiring to become one) and would like to know more about the economics of using Dplug and the D language for plug-ins, do not hesitate to reach out and join the party
I believe it is a particularly risk-free alternative.
You'll find more detail on the project page:
https://github.com/AuburnSounds/Dplug
