Also a shout-out to @EricMatyas . They're unaffiliated with this project, but I have used their music and image assets provided on soundimage.org . They also cross-promote on these forums: https://godotforums.org/discussion/22845/sharing-my-music-and-sound-fx-over-2000-tracks#latest https://godotforums.org/discussion/20489/free-2d-game-art-for-your-projects#latest
It's not CC licensed, but it's still a free attribution license, with more requisites around attribution. Good, fairly consistent quality. I recommend it.