Premade things you can use for your games!
LemmaSoft CC Forum (lots of things in here)
Sprites:
https://itch.io/c/2006928/my-free-visual-novel-characters-for-your-use
https://itch.io/c/228580/assets-i-created
https://itch.io/c/1115123/new-style-free-to-use-assets
https://banya.itch.io/free-sprites-vn
https://itch.io/c/698965/yume-series-free-to-use-assets
https://sutemo.itch.io/
https://chibi785.itch.io/
https://cucurbitapepo.itch.io/girl-sprites-for-visual-novel
https://dejinyucu.itch.io/
https://minttydrops.itch.io/
https://duokhay.itch.io/
Backgrounds:
https://itch.io/c/2006931/my-free-visual-novel-backgrounds-and-items-for-your-us...
https://katy133.itch.io/vn-asset-pack
https://tidalblossoms.itch.io/free-outdoor-visual-novel-backgrounds
https://noranekogames.itch.io/yumebackground
https://chibi785.itch.io/cafe-background
https://vision-renders.itch.io/
https://konett.itch.io/misc-visual-novel-background
GUI:
https://thaumaturge-art.itch.io/assets-fantasy-ui
https://tofurocks.itch.io/renpy-gui-template
https://loudeyes.itch.io/dating-sim-ui-pack
https://florassence.itch.io/
https://lunalucid.itch.io/free-character-creation-template-for-renpy
Music SFX:
https://cross-couloir.itch.io/beats-by-cross-couloir
https://lemmasoft.renai.us/forums/viewtopic.php?t=48443
https://lemmasoft.renai.us/forums/viewtopic.php?t=54072
https://lunalucid.itch.io/free-creative-commons-bgm-collection
https://mayragandra.itch.io/freeemotionalpianomusic
https://soundimage.org/
https://dreamer173.bandcamp.com/