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GDAL - Geospatial Data Abstraction Library

GDAL is an open source translator library for raster geospatial data formats as a library it presents a single abstract data model to the calling application for all supported formats related project like ogr and fwtools can be found from this site.

 http://www.gdal.org/
GeoServer

GeoServer is an Open Source server that connects your information to the Geospatial Web. With GeoServer you can publish and edit data using open standards. Your information is made available in a large variety of formats as maps/images or actual geospatial data, and you have complete control over the look of the map.

 http://geoserver.org
GRASS - Geographic Resources Analysis Support System

A Geographic Information System (GIS) used for geospatial data management and analysis, image processing, graphics/maps production, spatial modeling, and visualization. GRASS is currently used in academic and commercial settings around the world, as well as by many governmental agencies and environmental consulting companies.

 http://grass.itc.it/
MapServer

MapServer is an Open Source development environment for building spatially-enabled internet applications. MapServer is not a full-featured GIS system, nor does it aspire to be. Instead, MapServer excels at rendering spatial data (maps, images, and vector data) for the web.

 http://mapserver.gis.umn.edu/
OpenLayers

OpenLayers makes it easy to put a dynamic map in any web page. It can display map tiles and markers loaded from any source. MetaCarta developed the initial version of OpenLayers and gave it to the public to further the use of geographic information of all kinds. OpenLayers is completely free, Open Source JavaScript, released under a BSD-style License.

 http://openlayers.org/
OSGeo - Open Source Geospatial Foundation

The Open Source Geospatial Foundation is a not-for-profit organization whose mission is to support and promote the collaborative development of open geospatial technologies and data. The foundation provides financial, organizational and legal support to the broader open source geospatial community.

 http://www.osgeo.org/content/foundation/about.html
OSSIM - Open Source Software Image Map

OSSIM provides advanced geo-spatial image processing for remote sensing, photogrammetry, and Geographic Information Systems. Backed by an active open source software development community, OSSIM solutions have been deployed on a number of critical commercial and government systems.

 http://www.ossim.org/OSSIM/OSSIMHome.html
PostGIS

PostGIS is a spatial database extension for the popular PostgreSQL object-relational database. PostGIS “spatially enables” the PostgreSQL server, allowing it to be used as a back-end spatial database for geographic information systems (GIS) and web-mapping applications in the same manner as Microsoft's SQL Server Spatial and Oracle's Spatial database extension.

 http://postgis.refractions.net
Spatial Reference

Spatial Reference is a great resource for coordinate systems, projections, etc. It provides a searchable interface to spatial references and output formats including EPSG, proj4, WKT and more.

 http://www.spatialreference.org/
uDig - user-friendly Desktop Internet GIS

uDig is an Open Source GIS Framework for Eclipse, built with Eclipse Rich Client (RCP) technology. uDig is a great companion to PostGIS.

 http://udig.refractions.net