EasyVst is a small, easy-to-use VST3 wrapper that makes it easy to host VST3 plugins without using JUCE or any other framework. By default, it uses SDL2 to create the window in which plugin GUIs are displayed; however, it should be straightforward to modify this code to use any other library for window creation.
Your choice of Public Domain (Unlicense) or MIT No Attribution - please read the LICENSE file for more details. This license does not apply to the Steinberg VST SDK which is wrapped by EasyVst; the Steinberg SDK has additional terms and conditions to which you must also agree if you choose to incorporate it into your product.