After many decades in beta, the excellent free Stellarium desktop software is finally in a stable version 1.0. Useful for casual astronomers and night-sky watchers, and its time-travel function also makes it useful for historical researchers and writers of historical fiction.

Slightly confusingly, 1.0 stable is officially 0.22.3 for Windows 7, and 1.22.3 for other lesser Windows OS’s.