Awesome Web GIS resources is a collection of geospatial related web resources and tools aimed to work with geospatial data, such as cartographic tools, data generation, data visualization, and much more.
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Inspired by awesome-gis.
Bivariate choropleth color generator
Chroma.js Color Palette Helper
Maperture, a web application for comparing webmap styles.
Cartographer, a visualization tool that breaks down different stylesheet properties by layer and zoom level for easy analysis and debugging.