HNSKY

HNSKY or Hallo Northern Sky is a freeware planetarium program for Linux and Microsoft Windows to simulate the night sky. It is provided with several non-English language modules, as well as several stellar databases.

HNSKY was originally created by Dutchman Han Kleijn in 1998, who continues to develop and maintain the application.

Initially a basic planetarium program, it has expanded in functionality to include the ability to control computerised GoTo telescope mounts, and is ASCOM compliant and supports the USNO's UCAC4 catalog.