MapShaper - Tools for editing Shapefile, GeoJSON, TopoJSON and CSV files
Mapshaper is software for editing Shapefile, GeoJSON, TopoJSON, CSV and several other data formats, written in JavaScript. The mapshaper command line program supports essential map making tasks like simplifying shapes, editing attribute data, clipping, erasing, dissolving, filtering and more.
http://mapshaper.org
https://github.com/mbloch/mapshaper
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