OpenLayers is a high-performance, open-source JavaScript library for displaying dynamic maps and vector data on any web page.

GeoJSON is an open standard format for encoding geographic data structures, including Points, Polygons, and Features, used by web developers.

MyGeodata Converter is a GIS/CAD data conversion and transformation tool for geospatial data and is used by geospatial professionals.

Turf.js is the best geospatial toolkit for typescript and is used by developers for advanced geospatial analysis.

geojson.io is a tool for creating, viewing, and sharing spatial data and is used by GIS professionals.