Cube

http://www.colorcube.com/

Chroma

http://www.huevaluechroma.com/

Mind

http://colormind.io/

Code

https://htmlcolorcodes.com/
https://html-color-codes.info/
https://html-color.codes/
https://www.hexcolortool.com/
http://htmlcolorcodes.org/

Tube
https://www.youtube.com/results?search_query=htmlcolorcodes

Slides
https://www.slideshare.net/search/slideshow?searchfrom=header&q=html%20color%20codes

Cool

https://coolors.co/

Broken