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PostGIS is a spatial database extender for PostgreSQL object-relational database. It adds support for geographic objects allowing location queries to be run in SQL. PostGIS adds extra types (geometry, geography, raster and others) to the PostgreSQL database. It also adds functions, operators, and index enhancements that apply to these spatial types.
The JUMP DB Query Plugin is an extension for the OpenJUMP GIS platform that allows OpenJUMP users to give arbitrary database queries to retrieve and display geographic feature sets. Spatial databases currently supported are PostGIS, Oracle Spatial, MySQL, and SpatiaLite.
Geographic Resources Analysis Support System, commonly referred to as GRASS GIS, is a Geographic Information System (GIS) used for data management, image processing, graphics production, spatial modelling, and visualization of many types of data. GRASS supports raster and vector data in two and three dimensions. The vector data model is topological, meaning that areas are defined by boundaries and centroids; boundaries cannot overlap within a single layer.
Geo-Spatial Data Viewer (GSDView) is a lightweight viewer for geo-spatial data and products. It is written in python and Qt4 and uses the GDAL library. GSDView is modular and has a simple plug-in architecture.
This project produces an Extension and VBA module that allows ESRIs ArcMap (v8.x) product to access Open Source Postgresql/PostGIS spatial data tables. Includes importing tables and exporting/updating back to the database. Currently using Postgresql OD
uDig is an open source desktop application framework, built with Eclipse Rich Client (RCP) technology. The goal of uDig is to provide a complete Java solution for desktop GIS data access, editing, and viewing. It supports GeoRSS, geospatial web services and provides the framework on which complex analytical capabilities can be built, and gradually subsuming those capabilities into the main application.
Kalypso is an open source application for geospatial modelling and simulation. It is primarily developed to be a user friendly tool for GIS-based modelling and simulation of hydrological and hydraulic numerical models.
MicroCity is a framework for spatial analysis and simulation. It is lightweight, fast, portable, extendable and user friendly. Users can easily operate large GIS and Grid data and perform Spatial, Fractal, Network analysis and simulation.
Open Source Hydraulic Network Analysis Software. A plug-in for Quantum GIS (QGIS) that allows you to create EPANET hydraulic analysis models. EPANET is a popular open source software to analyze water supply networks.