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Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

The third-party Telegram android app.

The JTS Topology Suite is a Java library for creating and manipulating vector geometry.

Official GeoTools repository

A library for writing CZML content for use with Cesium.

Official mago-3d-tiler repository, Java Version 3D Tiles Generator

Official deegree repository providing geospatial core libraries, data access and advanced OGC web service implementations

Official mago-3d-terrainer repository, Java Version of the quantized-mesh Generator

Library for converting between OSGB and WGS84 coordinates