Sites and apps similar to Atlas of Space include Stellarium, which is free and open source. Other options are Celestia, Sky Map, KStars and Space Engine. There's no shortage of Star Maps like Atlas of Space, with more than 50 alternatives for iPhone, iPad, Android, Windows and Mac.
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.
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!
Planetensuche (Planet Search) is a comprehensive, free, and offline-capable desktop application designed for amateur astronomers, space enthusiasts, and researchers to explore, visualize, and analyze data about exoplanets, stars, and deep-sky objects.
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