draw.io - Online diagramming application
QGIS - QGIS is a desktop geographic information system, or GIS.
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
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.
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Google Maps - Find local businesses, view maps and get driving directions in Google Maps.