KStars is described as 'Desktop Planetarium for KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time' and is a Star Map in the Education & Reference category. There are more than 25 alternatives to KStars for a variety of platforms, including iPhone, iPad, Android, Windows and Android Tablet. The best alternative is Google Earth. It's not free, so if you're looking for a free alternative, you could try Stellarium or Sky Map. Other great apps like KStars are Gaia Sky (Free, Open Source), Star Walk (series) (Paid), Sky Guide (Paid) and Solar System Scope (Freemium).
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. You can explore rich geographical content, save your toured places, and share with others.
SkySafari is a powerful planetarium that fits in your pocket. It puts thousands of stars and planets at your fingertips. It lets you find objects in the sky using your device's built-in compass and accelerometer.
SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more. Simply point the camera to the sky, tap on what you see and discover neat things about these sky objects.