The matplotlib colormaps introduced in 2015 are widely popular, with implementations of the palettes in R, D3js, and others. Popular for good reason, the palettes are colorblind-friendly, retain representational clarity in greyscale, and are generally aesthetically pleasing.
This tool provides a convenience wrapper around D3js's viridis implementation for use in data visualization tools with manual color value specification (e.g., Microsoft Excel, ArcGIS, and Tableau to name a few). To begin, select the number of categories and the color palette you'd like to use.