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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
GeoMesa is a suite of tools for working with big geo-spatial data in a distributed fashion.
GeoTrellis is a geographic data processing engine for high performance applications.
uDig parent project containing all core components. More plugins can be found in community repos: http://github.com/uDig-Community
Geospatial Raster support for Spark DataFrames
LocationTech Spatial4j: A Geospatial Library for Java
Java port of the Proj.4 library for coordinate reprojection
Geoff project at LocationTech
LocationTech SFCurve is a Scala library for the creation, transformation, and querying of space-filling curves