References
✦ cmocean
From "Beautiful colormaps for oceanography": cmocean
✦ scientific
From Scientific colormaps
✦ matplotlib
From matplot
✦ colorbrewer
From ColorBrewer
✦ gnuplot
From GNUPlot
✦ colorcet
From "collection of perceptually accurate colormaps"
✦ Seaborn
From "colorschemes used by Seaborn, a Python data visualization library based on matplotlib."
✦ ggthemes/tableau
From "ggthemes tableau palettes"
✦ CVD/(ColorBlind)-friendly schemes
Colorschemes designed with color-vision deficient users in mind, by authors such as Paul Tol, Masataka Okabe, Kei Ito, and Martin Krzywinski.
✦ Flags
Colors extracted from flags of different countries and regions, downloaded from Flagpedia. Intended to represent these regions in visualizations, but not necessarily effective. Many flags have similar colorschemes. The flags are named according to the region's ISO3166 two-letter abbreviation (often the same as top-level WWW domain), with any hyphens removed.