I was under the impression that Daytrotter was well-known, but apparently not.
It's a sort of studio where bands stop by on their tours and record a few of their songs using mostly borrowed instruments and stuff, and Daytrotter releases those recordings for free.
Most of the bands are indie, but there are a few bands like Thrice and LIGHTS and stuff who have contributed. Check it out.
https://www.daytrotter.com/