Where to find it: WikiSkyÂ
While this one is primarily for stargazers, nearly anyone can find it both useful and fun. WikiSky is a star map of sorts, but with a Google Maps-like twist: you can click and drag the map, and choose to show or hide layers including constellation drawings. You can also move the sky to show what is directly above you at that moment, with a single click. Many stars can be moused over to get in-depth details. The best part? It’s all on the Web, so you don’t need to download a thing.
See Also: Celestia, Stellarium
