QGIS is an Open Source Geographic Information System. QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster and vector data formats, with new support easily added using the plugin architecture.
 
QGIS provides a continously growing number of capabilities provided by core functions and plugins. You can visualize, manage, edit, analyse data, and compose printable maps.

QGIS is an Open Source Geographic Information System. QGIS aims to be an easy to use GIS, providing common functions and features. The initial goal was to provide a GIS data viewer. QGIS has reached that point in its evolution and is being used by many for their daily GIS data viewing and editing needs. QGIS supports a number of raster and vector data formats, with new support easily added using the plugin architecture.

QGIS - Geographical Information System (GIS)

Mapsforge project uses a compact file format for fast ad-hoc rendering of OpenStreetMap data. It provides tools to compile your own maps with detailed instructions and also precompiled maps, Simple boilerplate code to build applications for Android that display OpenStreetMap-based maps. Mapsforge maps can be flexibly styled with XML style files (render themes).

Mapsforge - Vector map library written in Java - running on Android and Desktop.

Whitebox GAT is an open-source geographical information system (GIS) and remote sensing package. The Whitebox GAT project began in 2009 and was conceived as a replacement for the Terrain Analysis System (TAS). Whitebox GAT is intended to provide a platform for advanced geospatial data analysis with applications in both environmental research and the geomatics industry more broadly.
 
It was envisioned from the outset as providing an ideal platform for experimenting with novel geospatial analysis methods. Equally important is the project’s goal of providing a tool that can be used for geomatics-based education.

Whitebox GAT is an open-source geographical information system (GIS) and remote sensing package. The Whitebox GAT project began in 2009 and was conceived as a replacement for the Terrain Analysis System (TAS).  Whitebox GAT is intended to provide a platform for advanced geospatial data analysis with applications in both environmental research and the geomatics industry more broadly.

Whitebox Geospatial Analysis Tools - An open-source GIS and remote sensing package

With the continuous efforts of adjusting search results to focused target audieces, there's an increasing demand for incorporating geographical location information into the standard search functionality. Spatial Solr Plugin (SSP) is a free, standalone plug-in which enables Geo / Location Based Search, and is built on top of the open source projects Apache Solr and Apache Lucene. This plugin is very useful if you want to provide location based search in your application. Source code: <A HREF="http://code.google.com/p/spatial-search-lucene/" target="_blank">http://code.google.com/p/spatial-search-lucene/</A>

With the continuous efforts of adjusting search results to focused target audieces, there's an increasing demand for incorporating geographical location information into the standard search functionality. Spatial Solr Plugin (SSP) is a free, standalone plug-in which enables Geo / Location Based Search, and is built on top of the open source projects Apache Solr and Apache Lucene.

Spatial Solr Plugin for Lucene and Solr

GeoCouch is a spatial extension for Couchbase and Apache CouchDB.This version of GeoCouch needs at least Apache CouchDB 1.3.x.

GeoCouch - A spatial index for CouchDB

SAGA is a free geographic information system (GIS), with a special 'Application Programming Interface' (API) for geographic data processing. This API makes it easy to implement new algorithms. The SAGA API supports grid data, vector data, and tables. It has been designed for an easy and effective implementation of spatial algorithms.
 
It supports far more than 450 freely available functions for geodata analysis, Georeferencing and cartographic projections, Geostatistics: GWR, variograms, ordinary & universal Kriging and lot more.

SAGA is a free geographic information system (GIS), with a special 'Application Programming Interface' (API) for geographic data processing. This API makes it easy to implement new algorithms. The SAGA API supports grid data, vector data, and tables. It has been designed for an easy and effective implementation of spatial algorithms.

SAGA GIS - System for Automated Geoscientific Analyses

The JCS Conflation Suite is an API and set of interactive tools which perform conflation on spatial datasets. It features:
 <ul>
	<li>JCS contains functions for performing various kinds of geo-spatial conflation processes.&nbsp;
	 The major conflation problems it addresses are Coverage Cleaning,
	 Coverage Alignment and Road Network Matching.&nbsp;&nbsp;
	<li>JCS supports QA operations for detecting and visualizing errors and
	 both automatic and manual cleaning functions to adjust geometry.&nbsp;
	<li>JCS supplies an API providing full programmatic access
	 to all functions
	<li>JCS provides manual editing tools to perform human-assisted conflation for
	 cases which automated methods cannot solve
</ul>

The JCS Conflation Suite is an API and set of interactive tools which perform conflation on spatial datasets.

JCS - Conflates spatial datasets

 SpatiaLite is an open source library intended to extend the SQLite core to support fully fledged Spatial SQL capabilities. SQLite is intrinsically simple and lightweight, It is a single lightweight library implementing the full SQL engine. SpatiaLite is smoothly integrated into SQLite to provide a complete and powerful Spatial DBMS (mostly OGC-SFS compliant). Using SQLite + SpatiaLite you can effectively deploy an alternative open source Spatial DBMS roughly equivalent to PostgreSQL + PostGIS. 

SpatiaLite - Spatial SQL

An easy-to-implement library that can assist Java developers in using the GeoHash algorithm in order to create geocodes based on custom latitude and longitude values. With the help of jGeohash, Java developers will be able to quickly and easily generate a geohash code using user-defined latitude and longitude values. By using the GeoHash algorithm, the space can be divided into multiple grid shapes.

jgeohash - An easy-to-implement library for the GeoHash algorithm

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