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The JTS Topology Suite is a Java library for creating and manipulating vector geometry.
GeoWave provides geospatial and temporal indexing on top of Accumulo, HBase, BigTable, Cassandra, and DynamoDB
Java port of the Proj.4 library for coordinate reprojection
uDig parent project containing all core components. More plugins can be found in community repos: http://github.com/uDig-Community
LocationTech Spatial4j: A Geospatial Library for Java