GeoNetwork opensource Community website "is a standards based, Free and Open Source catalog application to manage spatially referenced resources through the web."
Open Source Geospatial Consortium Inc. (OGC) "is a non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services."
Chameleon is an Open Source Solution for "producing a highly customizable and adaptable environment for deploying and managing Web mapping applications."
Geoserver " is an Open Source server that connects user information to the Geospatial Web."
Geo Tools - Java GIS Toolkit " is an open source (LGPL) Java code library which provides standards compliant methods for the manipulation of geospatial data."
GRASS GIS "is an open source, free software with raster, vector, image processing, and graphics production functionality."
Mapbuilder "is a powerful, standards compliant geographic mapping client which runs in a web browser."
MAPSERVER "is an Open Source development environment for rendering spatial data (maps, images, and vector data) for the web." MapLab "is a suite of Web-based, open source tools that simplifies the process of deploying MapServer Web mapping applications."
PostgreSQL "is a powerful, open source relational database system."
PostGIS "adds support for geographic objects to the PostgreSQL object-relational database."
Quantum GIS (QGIS) " is a user friendly Open Source Geographic Information System (GIS) that runs on Linux, Unix, Mac OSX, and Windows."
Shapefile C Library V1.2 "provides the ability to write simple C programs for reading, writing and updating (to a limited extent) ESRI Shapefiles, and the associated attribute file (.dbf)."