https://speller.cs.pusan.ac.kr/   (맞춤법 검사)

 

 https://pixlr.com/  (포토샵)

 

https://pixabay.com/ko/    (이미지창고)

 

https://www.flaticon.com/   (아이콘)

 

https://www.canva.com/  (ppt)

 

https://www.slideshare.net/  (슬라이드)

 

https://www.ted.com/  (테드)

 

https://www.kriss.re.kr/index.do   (논문)

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