Spleeter is a free (donation possible) Music Source Separation utility that can split a song in to it’s separate parts. This can be useful for restoring old vinyl recordings or cutting samples for remixing.
Vamp PlugIns need a host like Sonic Visualizer and offer many interesting features to process audio files. For example MIDI data can be extracted, to mention only one. THESE ARE ALL FREE. How to install Install on Win 10 64 Bit: Use 32 Bit version and move (/create) folder Program Files(x86/Vamp Plugins and copy plugin data into there.