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Stellarium - Stellarium is a free open source planetarium for your computer.
SmallDevTools - Handy developer tools with a delightful interface
KStars - KStars is a Desktop Planetarium for KDE.
whatdevsneed - This is whatdevsneed.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.
Google Open Source - All of Googles open source projects under a single umbrella