OpenStreetMap
Collaborative project to create a free editable map of the world.
The software provides the web front‑end and API for a collaborative, editable world map. It implements user accounts, diary entries, messaging, and browsing pages that display map data. An XML/JSON editing API lets contributors upload and modify geographic information, while GPX files can be uploaded, viewed and accessed through the same API.
It is built with Ruby on Rails, stores data in PostgreSQL, and relies on external services such as map tile and geocoding providers. The default setup uses publicly available services for development and testing, but a full installation can be self‑hosted with the required dependencies.
The project is open source under GPL‑2.0, maintained by a community of developers, and welcomes contributions via pull requests, issue tracking, translation platforms, and mailing lists. It is stable, free‑tier, and does not require a subscription.
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