WorldWide Telescope Alternatives

Google Earth

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. Available also on Android and iPhone: see http://www.google.com/intl/en/mobile/earth/

Features:

• Google Drive integration
• Street panning and viewing

Stellarium

Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope. It is being used in planetarium projectors. Just set your coordinates and go.

Features:

• 3d animation
• Education
• Portable

Celestia

Celestia is a free real-time 3D space simulation, allowing unrestricted access to hundreds of thousands of stars. Celestia ... The free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X. Unlike most planetarium software, Celestia doesn't confine you to the surface of the Earth. You can travel throughout the solar system, to any of over 100,000 stars, or even beyond the galaxy.

Features:

• Simulation
• Portable

KStars

KStars is a Desktop Planetarium for KDE. It provides an accurate graphical simulation of the night sky, from any location on Earth, at any date and time. The display includes upto 100 million stars, 13,000 deep-sky objects,all 8 planets, the Sun and Moon, and thousands of comets and asteroids.

StarCalc

StarCalc is the fastest professional astronomy planetarium & star mapping program for Windows 9x/ME/NT/2000/XP (StarCalc version for PocketPC is available). It illustrates star positions of any instance of the day observed from any geographic locations on the Earth. The star positions can be viewed and presented as images of hemispherical whole sky or any of the user defined sub-areas. These images can be zoomed at different scales, rotated, screen-captured and printed.

Gaia Sky

Gaia Sky is a real-time, 3D, astronomy visualisation software that runs on Windows, Linux and OS X. It is developed in the framework of ESA's Gaia mission to chart about 1 billion stars of our Galaxy in the Gaia group of the Astronomisches Rechen-Institut (ZAH, Universität Heidelberg). Main Features - Free and open source - The application is free and open source published and distributed under the LGPL (Lesser General Public License) license and will stay this way.

Features:

• Notifications
• 3d animation
• Education
• Simulation

Solar System Scope

3D simulation of the Solar System and night sky - real time virtual orrery and observatory Features: - Heliocentric view with real-time positions of planets and planetary orbits - Schematic and realistic sizes of the planets and distances between them - Movement of the planets in time to see how they move in relation to each other - Virtual Orrery - Planetary exploration with info texts, images and additional views such as structure - Moons (Galilean moons, Deimos & Phobos, Titan...

Features:

• Multiple languages
• Works Offline

Planetarium

A browser-based virtual planetarium of stars and planets customizable by location (latitude and longitude) and time of day.

Features:

• Browser based
• Based on Flash Player

Aciqra

Aciqra (uh-SEE-kruh) is a free and open source virtual sky map and planetarium which tracks and displays astronomical bodies including planets, nebulae and stars to an accuracy of a fraction of a degree for thousands of years into both the future and the past. It's software that generates a virtual sky so you'll know what's up in the real one.

Aladin

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 other archives for all known astronomical objects in the field.