Social Source Commons

3D Route Builder is a powerful utility for fine grain control over paths directly in Google Earth.

Arc2Earth was created to convert and publish your ArcGIS data to view in Google Earth, Google Maps or Virtual Earth

ArcView is full-featured GIS software for visualizing, managing, creating, and analyzing geographic data.

Location-based social-networking site.

a powerful web-based system that lets you store and manage just about any kind of information and share it over the web

Nautical data mashup for Google Earth.

The basic idea behind Fire Eagle is to become the link between your location and the services that you want to give your location to. You can feed your location to Fire Eagle from your GPS unit, cell phone, laptop, etc, then their applications can use it for whatever task you give them permission for.

Geographic.org offers free, downloadable maps and flags from around the world. Ideal for finding graphics for international presentations. Additional features include a list of country and airport codes.

Google Earth combines satellite imagery, maps and the power of Google Search to put the world's geographic information at your fingertips.

Google Map Maker is a Google Maps service that allows you add or edit features, such as roads, businesses, parks, schools and more. Using Google Map Maker tools, you can visually mark locations and add detailed information about these locations.

The Google Maps API lets you embed Google Maps in your own web pages with JavaScript. The API provides a number of utilities for manipulating maps (just like on the http://maps.google.com web page) and adding content to the map through a variety of services, allowing you to create robust maps applications on your website.

The open source GIS platform, powerful and cross platform

With HoudahGeo you may "pin" photos to the locations where they were taken.

Ipoki is a GPS-based social network.
Ipoki lets you connect with others to share geolocation information.

Advanced GIS and Mapping software, competes with Arcview

Maporama offers tools for calculating distance between cities; driving directions; and real-time traffic information for countries in Europe, Asia, South America, Africa, and beyond.

UMN MapServer

Mapufacture provides dynamic, customizable geographic information and collaborative mapping.

Free/Open Source ActiveX GIS Mapping and analysis tool

The Minimap Addon gives you a suite of in-built maps and mapping tools for Firefox.

World Wind lets you zoom from satellite altitude into any place on Earth. Leveraging Landsat satellite imagery and Shuttle Radar Topography Mission data, World Wind lets you experience Earth terrain in visually rich 3D, just as if you were really there.

GPS mapping program

Free, Open dynamic web mapper. (An alternative to Google/Yahoo Maps)

Service that enables people to tag and share real time environmental data from objects, devices and spaces around the world.

PixGPS is a simple program for Microsoft Windows that makes it simple to insert the exact position of each photo (latitude and longitude) into the photos EXIF meta data.

Platial enables anyone to find, create and use meaningful maps of Places that matter to them.

PolicyMap is an innovative geographic information system which allows you to easily create custom maps, tables, and charts.

QGIS FOSS Desktop Geographic Information System (GIS)

StarTraX is a program that allows you to relive your GPS journey in real time. High definition images from Google Earth combine with StarTraX to show you exactly where you’ve been.

Site for tagging geographic locations.

Social networking site based around personalized maps.

ZMaps is a set of online tools based on Google Maps and Yahoo Maps.