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PostGIS is a spatial database extension for PostgreSQL. PostGIS complies with the OpenGIS "Simple Features for SQL" specification, and provides high-performance spatial SQL access to GIS objects in the database.
The JTS Topology Suite is an API of 2D spatial predicates and functions. It has the following design goals: * JTS conforms to the Simple Features Specification for SQL published by the Open GIS Consortium * JTS provides a complete, consistent, robust implementation of fundamental 2D spatial ... [More]
Hibernate Spatial is a generic extension to Hibernate for handling geographic data. It is generic in the sense that it works in the same way across different databases. Hibernate Spatial allows you to deal with geographic data in a standardized way, whatever database that you use (as long as a ... [More]
A port of JTS to .Net, rewritten to take advantage of CLR constructs, as well as remove some of the legacy issues in JTS.
NetTopologySuite is a C#/.NET port of JTS Topology Suite, a Java library for GIS operations, (OpenGIS compliant). The main goal of this project is to have a .NET GIS solution that is fast and reliable for any kind of .NET platform, PocketPC and SQL Server 2005 (through CLR integration) included.
MsSqlSpatial - Spatial Extensions for SQL Server 2005. This project conforms to OGC Simple Features Specification for SQL Revision 1.1 and provides many useful features to power GIS applications.
OrbisGIS is a Geographic Information System developped for and by research. . This cross-platform GIS is developed by French IRSTV institute and is able to manipulate and create vectorial and raster spatial data. OrbisGIS is distributed under GPL 3 license.