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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90 Languages
Ukrainian	100%
Galician	100%
Lithuanian	99%
Spanish	99%
Spanish (Latin America)	97%
Swedish	97%
Russian	97%
German	92%
Dutch	90%
Chinese (China)	86%
Arabic	85%
Finnish	84%
Slovak	73%
Japanese	71%
French	69%
Catalan	62%
Chinese (Taiwan)	60%
Italian	57%
Czech	57%
Chinese (Hong Kong)	53%
Croatian	53%
Gaelic, Scottish	51%
Catalan (Valencian)	49%
Sardinian	49%
Turkish	47%
Hungarian	43%
English (Canada)	39%
Norwegian Nynorsk	35%
Korean	34%
English (United Kingdom)	31%
English (United States)	25%
Portuguese (Brazil)	24%
Bengali	24%
Telugu	20%
Belarusian	19%
Bulgarian	18%
Indonesian	17%
Thai	16%
Hindi	14%
Polish	13%
Icelandic	10%
Hebrew	10%
Portuguese	9%
Romanian	9%
English (Australia)	8%
Slovenian	8%
Vietnamese	8%
Albanian	7%
Norwegian Bokmål	6%
Estonian	6%
Serbian	6%
Malay	5%
Latin	5%
Persian	5%
Greek	5%
Basque	4%
Danish	4%
Breton	3%
Bosnian	3%
Azerbaijani	3%
Tamil	2%
Armenian	2%
Latvian	2%
Malayalam	2%
Marathi	2%
Sinhala	2%
Afrikaans	2%
Luxembourgish	2%
Tatar	1%
Georgian	1%
Gujarati	1%
Nepali	1%
Javanese	0%
Maori	0%
Western Frisian	0%
Tigrinya	0%
Welsh	0%
Amharic	0%
Venetian	0%
Uzbek (Latin)	0%
English (India)	0%
Sanskrit	0%
Quechua	0%
Aymara	0%
Rapa Nui	0%
Tachelhit	0%
French (Canada)	0%
Kannada	0%
Acehnese	0%
Mapudungun	0%