LocationTech

GeoMesa is a suite of tools for working with big geo-spatial data in a distributed fashion.

Java port of the Proj.4 library for coordinate reprojection

GeoTrellis is a geographic data processing engine for high performance applications.

Repository to host configurations related to the Eclipse Foundation.

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

LocationTech Spatial4j: A Geospatial Library for Java

Geospatial Raster support for Spark DataFrames

GeoWave provides geospatial and temporal indexing on top of Accumulo, HBase, BigTable, Cassandra, Kudu, Redis, RocksDB, and DynamoDB.

GeoGig project

uDig parent project containing all core components. More plugins can be found in community repos: http://github.com/uDig-Community