AAS WorldWide Telescope enables you to explore the universe, bringing together imagery from the best ground and space-based telescopes in the world and combining it with 3D navigation.

A free and open source virtual planetarium and sky mapping program which tracks most celestial bodies.

Get a quick overview on what is going on today's night sky.

Celestia is a free space simulation that lets you explore our universe in three dimensions.

Earth Alerts allows you to monitor, via satellite imagery and other formats, in near real-time a variety of natural hazard events occurring around the world.

EarthView is a dynamic desktop wallpaper and screen saver, displaying beautiful views of the earth with daylight and night shadows.

EasyGPS allows you to both upload and download waypoints, routes and more between your computer and your Garmin, Magellan or Lowrance GPS.

Gaia Sky is a real-time, 3D, astronomy visualization software developed in the framework of ESA's Gaia mission to chart about 1 billion stars in our Galaxy.

Garmin Express is designed to help you manage your Garmin GPS devices by updating maps, activities and more.

GetNexrad converts radar dBZ (decibel relative to Z) to rainfall amounts with loops and graphical storm tracking.

Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies in outer space to the canyons of the ocean.

Gpredict provides real-time satellite tracking and orbit prediction from a data-oriented interface.

GPX Creator allows you to input a specific address to your GPS device using a USB connection - perfect for planning a trip's way-points a head of time.

ISS Tracker offers those that enjoy tracking the ISS a simple option to do so.

KStars is a desktop planetarium that provides an accurate graphical simulation of the night sky, from any location on Earth.

View Mars with this program from NASA.

Marble is a virtual globe and world atlas — your swiss army knife for maps.

MetarWeather is a utility for decoding METAR weather reports from around the world and displaying them in a simple report table.

MiTeC Weather Agent is a free app that enables you to view your local 5-day forecast, and it also includes moon phases as well as sunrise/sunset times for your region.

MyTourBook is an Open Source app to visualize and analyze tours which are recorded by a GPS device, bike- or exercise computer and ergometer.

NASA’s Eyes allows you to experience Earth and our solar system, the universe, and the spacecraft exploring them.

OkMap Desktop is an interactive GPS map software that will allow you to work with digital maps.

The Overlooked Objects Log (OOLog) is very similar to The Ultimate Messier Object Log, except it deals with the 45 objects in Brent Watson's excellent book, "Finder Charts of Overlooked Objects."

OpenCPN is a chart plotter and navigational app whether you're underway or making plans for a trip.

SkyChart gives the amateur astronomer the ability to draw and map out the night sky. 64 Bit also available.

SkyChart gives the amateur astronomer the ability to draw and map out the night sky. Also available for 32 Bit.

Stellarium is a free open-source planetarium for your computer that shows a realistic sky in stunning 3D.

iStreetView Downloader lets you enter a panorama into istreetview.com to print or transfer to a device to take with you.

sWeather is a configurable tray-based app that provides weather conditions for the places that are important to you.

TomTom Home can help you manage, update, backup, and make purchases with your Tomtom devices directly from your desktop.

Get up to date weather alerts featuring 4 different API's & millions of cities across the globe - powered by Yahoo Weather API, Openweather API, Forecast IO API & Wunderground API.

Weather Beetle is a free desktop weather application that retrieves text and graphical weather forecasts and current conditions from the NOAA (National Oceanic and Atmospheric Administration) weather service.

The Weather Watcher Live application is your personal, real-time Windows desktop satellite weather station.

WeatherDan is a small and accurate virtual weatherman that runs in your system tray.

WeatherInfo provides weather data for your current location or any place you choose.

WeatherMate is a little Windows program that gives you instant access to the weather forecast for tens of thousands of locations worldwide.

Windows Maps provides you with everything needed to guide you anywhere you need to go.

WinStars is a planetarium 3D simulator that accurately represents the position of celestial objects at a given moment. Free version also available.

WinStars 2 is the free version of the popular 3D planetarium simulator that allows you to view the position of celestial objects.

World Wind lets you zoom from satellite altitude into any place on Earth.

YoWindow gives you the ability to watch weather like never before on Windows and Mac. See the weather picture, not just numbers.