By source

Fabio Crameri’s Scientific Colour Maps

https://www.fabiocrameri.ch/colourmaps/

Colorbrewer

https://colorbrewer2.org/#type=sequential&scheme=BuGn&n=3

Cartocolors

https://carto.com/carto-colors/

cmocean

https://matplotlib.org/cmocean/

matplotlib

https://bids.github.io/colormap/

mycarta

https://mycartablog.com/color-palettes/

tableau

https://help.tableau.com/current/pro/desktop/en-us/formatting_create_custom_colors.htm#hex-values-for-discontinued-color-palettes

The Wes Anderson Palettes blog

https://wesandersonpalettes.tumblr.com/

Masataka Okabe and Kei Ito’s Color Universal Design (CUD) palette

https://jfly.uni-koeln.de/color/

‘A Dictionary of Color Combinations’ by Sanzo Wada

https://github.com/thomascamminady/APDOCC