A fast and memory efficient Java road routing engine under Apache License 2.0

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There are also subprojects to make GraphHopper working on Android or as a web service.

Solving shortest path (related) problems is the main goal. GraphHopper is a routing engine which makes implementing shortest path problems in Java easier and more efficient (faster, less memory, etc) than a naive implementation. GraphHopper is tuned for road networks at the moment but can be useful for public transport problems in the future as well.

• Written in Java
• Open Source
• Memory efficient and fast
• A small library (~3MB)
• Works on the desktop, as a web service and even offline on Android
• Well tested