tsgeo
TsGeo provides abstractions to geographical coordinates (including support for different ellipsoids) and allows you to calculate geographical distances between coordinates with high precision.
cartogram-chart
Cartogram web component for visualizing geographical data by distorting a TopoJson topology
geo-tree
High performance library for geographical map-related operations
astro-geo-map
Embed an interactive map in your webpage.
Using Leaflet.js under the hood.