CamFind - CamFind is the very first mobile application that can photograph, identify, and provide information...
Stellarium - Stellarium is a free open source planetarium for your computer.
IQDB - Multi-service image search
KStars - KStars is a Desktop Planetarium for KDE.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.