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draw.io - Online diagramming application
Mapbox - An open source mapping platform for custom designed maps. Our APIs and SDKs are the building blocks to integrate location into any mobile or web app.
Dia - Dia is a GTK+ based diagram creation program for GNU/Linux, MacOS X, Unix, and Windows, and is released under the GPL license.
OpenStreetMap - OpenStreetMap is a map of the world, created by people like you and free to use under an open license.
yEd - yEd is a free desktop application to quickly create, import, edit, and automatically arrange diagrams. It runs on Windows, Mac OS X, and Unix/Linux.
OSGeo - QGIS is a desktop geographic information system, or GIS.