Science

Celestia
Shatters(Free)
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A great way to learn about the universe
TuxMath
Tux4Kids(Free)
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Tux4Kubs Is A Fun Game For Kids Of All Ages
Picnik
Picnik(Free)
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A Powerful Free Science & Education Program for Mac - Picnik
WMF Viewer
Cristallight(Trial version)
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View and convert WMF images
Alarm Clock Pro
Koingo Software, Inc.(Paid)
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A Full Version Alarm Clock Program for Mac
Stykz
Sons of Thunder(Free)
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A free program for Mac, by Sons of Thunder.
Simple Comic
Dancingtortoise(Free)
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Versatile Comic Reading Experience on Mac
TimePassages
apple(Trial version)
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TimePassages: A Trial Version Mac Program for Astrology Enthusiasts
Satscape
Satscape(Free)
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Track Satellites on Your Desktop
Stellarium
Stellarium(Free)
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Stellarium for Mac provides you with accurate data about the night sky, which can be used by professional and amateur astronomers alike. Basically it's a planetarium for your computer. The applicatio