Stellarium

Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and MacOSX. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.

stellarium.org

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88 Languages
Spanish	100%
Spanish (Latin America)	100%
Lithuanian	100%
Ukrainian	100%
Russian	99%
Swedish	99%
Galician	99%
German	94%
Dutch	92%
Arabic	89%
Finnish	88%
Chinese (China)	88%
Slovak	76%
Japanese	74%
French	70%
Catalan	64%
Chinese (Taiwan)	63%
Czech	59%
Italian	59%
Chinese (Hong Kong)	55%
Croatian	55%
Gaelic, Scottish	53%
Sardinian	51%
Catalan (Valencian)	51%
Turkish	49%
Hungarian	45%
English (Canada)	41%
Korean	36%
Norwegian Nynorsk	36%
English (United Kingdom)	33%
English (United States)	27%
Bengali	25%
Belarusian	21%
Telugu	21%
Bulgarian	19%
Portuguese (Brazil)	18%
Indonesian	18%
Thai	16%
Hindi	15%
Polish	14%
Icelandic	11%
Hebrew	10%
Portuguese	10%
Slovenian	9%
English (Australia)	9%
Romanian	9%
Vietnamese	8%
Albanian	8%
Serbian	7%
Latin	6%
Malay	6%
Norwegian Bokmål	6%
Persian	6%
Estonian	6%
Greek	5%
Basque	4%
Danish	4%
Afrikaans	3%
Azerbaijani	3%
Bosnian	3%
Marathi	3%
Sinhala	3%
Breton	3%
Tamil	2%
Malayalam	2%
Latvian	2%
Luxembourgish	2%
Armenian	2%
Gujarati	2%
Nepali	2%
Georgian	1%
Tatar	1%
Javanese	0%
Maori	0%
Rapa Nui	0%
Tachelhit	0%
Western Frisian	0%
Tigrinya	0%
Acehnese	0%
Amharic	0%
Venetian	0%
Uzbek (Latin)	0%
Sanskrit	0%
Quechua	0%
French (Canada)	0%
Kannada	0%
Aymara	0%
Mapudungun	0%