Stellarium
Open-source planetarium software that shows the sky from any place and time
Free
Research Tools
Users pick a location and date to see stars, planets, and satellites, and can control telescopes through plug-ins. It includes sky cultures and deep sky catalogs.
A web version runs in the browser, and desktop apps exist for Windows, macOS, and Linux.
Cartes du Ciel is another open-source option. Stellarium suits astronomers and amateur observers.
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