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# GraphHopper Routing Engine
GraphHopper is a fast and memory efficient Java routing engine, released under Apache License 2.0.
By default it uses OpenStreetMap and GTFS data, but it can import other data sources.
We have an open community and welcome everyone. Let us know your problems, use cases or just [say hello](https://discuss.graphhopper.com/). Please see our [community guidelines](https://graphhopper.com/agreements/cccoc.html).
All questions go to our [forum](https://discuss.graphhopper.com/) where we also have subsections specially for developers, mobile usage, and [our map matching component](./map-matching). You can also search [Stackoverflow](http://stackoverflow.com/questions/tagged/graphhopper) for answers. Please do not use our issue section for questions :)
Read through [how to contribute](CONTRIBUTING.md) for information on topics
like finding and fixing bugs and improving our documentation or translations!
We even have [good first issues](https://github.com/graphhopper/graphhopper/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22) to get started.