GitHub - graphhopper/graphhopper: Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

Apache SIS - The Apache SIS™ library

GitHub - davidmoten/geo: Geohash utitlies in java

Geohash utitlies in java contribute to davidmoten geo development by creating an account on git hub

GeoTools The Open Source Java GIS Toolkit — GeoTools

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A spatial extension of the h2 database compliant solid tested

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GitHub - mapsforge/mapsforge: Vector map library and writer - running on Android and Desktop.

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GitHub - locationtech/spatial4j: LocationTech Spatial4j: A Geospatial Library for Java

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