Pure Data, or pd for the close friends, is a kind of graphical language for sound processing. The UI is kind of "do not touch me" at the first glance, but the fun you have making sounds after some hours of practice will make you say it totally worth it (I guarantee it !).
We regularly do pure data sessions with a friend to make some patches and have fun. Our patches are available on github: https://github.com/virtualtam/puredata-patches.
If you are interesetd in pure data, here is the website: https://puredata.info/
The following patches are some I have made only for this website purpose.