LunarSight - Accurate data about the Moon
Next Full Moon - All in one calendar to find the next full moon date
Solaris Sky Calendar - An astronomy calendar right in your pocket
Stellarium - Stellarium is a free open source planetarium for your computer.
Solar Walk - Solar Walk is a 3D model of our solar system, bringing the universe to the palm of your hand.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.