https://gongu.copyright.or.kr/
이미지, 영상, 음악, 어문, 무료폰트, 기타, 주제별 콘텐츠 등
https://www.miricanvas.com/
https://www.flaticon.com/
아이콘
https://pixabay.com/ko/
사진
https://www.vecteezy.com/
https://www.youtube.com/audiolibrary/music?nv=1
음원, mp3
http://www.kkacl.com/md
음원, mp3, 클래식
https://www.jamendo.com/
https://freemusicarchive.org/
https://freesound.org/
https://blog.naver.com/1n_out
https://blog.naver.com/shajung1999
https://blog.naver.com/serenity087
https://wkfdl1.tistory.com/category
https://blog.naver.com/dlxornjs0512
https://blog.naver.com/shrodk
https://blog.naver.com/yelimitless