Gaia Sky is described as 'real-time, 3D, astronomy visualisation software that runs on Windows, Linux and OS X' and is a Star Map in the Education & Reference category. There are more than 25 alternatives to Gaia Sky for a variety of platforms, including Windows, iPhone, iPad, Android and Mac. The best alternative is Stellarium, which is both free and Open Source. Other great apps like Gaia Sky are Celestia (Free, Open Source), Space Engine (Paid), Sky Map (Free, Open Source) and KStars (Free, Open Source).
Aladin is an interactive sky atlas allowing the user to visualize digitized astronomical images or full surveys, superimpose entries from astronomical catalogues or databases, and interactively access related data and information from the Simbad database, the VizieR service and...
Try out the solar system simulator to see the distance to Mars or other planets.
Point your iPhone to the sky and explore the movement of the sun, moon, planets and stars across the sky while you change time by swiping the display.
Warp to distant stars and explore various exoplanets like lava worlds, water worlds, earthlike planets or massive jovians with Stars and Planets planetarium app and astronomy guide. Space is awesome and the universe is at your fingertips!
The Starry Night apps are the most comprehensive educational astronomy apps. Use it with your introductory astronomy textbook or on its own. It's a powerful, portable planetarium that fits in your backpack. It puts thousands of stars and planets at your fingertips.
Systems Tool Kit (STK) is a platform for analyzing and visualizing complex systems in the context of your mission. Interact with data from platforms across the aerospace, defense, telecommunications, and other industries.
Planisphere is an astronomy application that lets you use pinch and finger gestures to manipulate a map of the sky. As you zoom in finer detail comes into view. You can double tap on objects to get more information.
Displays the sky view at the correct orientation when held at any angle not just landscape or portrait. Simple operation, no buttons to press or modes to select, just point to the sky to start exploring.