SimpleEQ is a simple audio plugin that allow 3 band equalization. It also comes with FFT spectrum analyzer. It's made with modern C++ and the JUCE Framework.
Just download the VST3 from the latest release and copy on your VST3 folder. Re-scan plugings on your DAW might be required.
You'll need an IDE compatible with JUCE framework. You can use Visual Studio on Windows or Xcode on MAC.
Download projucer and extract it wherever on your computer.
Open SimpleEQ.jucer with the projucer and select your IDE on 'Select exporter' field.
Once you've selected your IDE, launch the project using the IDE icon next to 'select exporter' field.
Check juce documentation if you need additional help launching the project from projucer.
Once you've open the project on your favourite SDK, you can compile the SimpleEQ_VST3 solution to generate the VST3 plugin.