Make Ambient Soundtracks With Bespoke Synth
Bespoke Synth is a free desktop-based app that lets you make really interesting sounds on your computer. Unlike many other Desktop Audio Workstation (DAW) tools like Garageband or Ableton, it uses a flow diagram interface.
It's really easy to learn and brilliant at making musical noises.
Learning
Bespoke Introduction
https://www.youtube.com/watch?v=SYBc8X2IxqM&ab_channel=RyanChallinorRyan explains some of Bespoke synth. It's worth watching because Bespoke has some fairly innovative UI, such as holding the space bar to move around, that can fox you if you don't know them.
There are also lots of other 10/20 minute videos of other people exploring and learning Bespoke from whom I learned a lot, and a really friendly and helpful Discord channel.
List of Free VSTs To Use With Bespoke
https://docs.google.com/document/d/1KH9LMu8R57bGyH4f7UAQlrDDNeGtxIkg1FOfEfaxnGM/edit?usp=sharingA document containing the free VSTs I have found.