SkyView - SkyView is powerful, easy-to-use app that answers questions about stars, constellations, and more.
Mapiful - Create & order custom printed maps of your favorite places
Stellarium - Stellarium is a free open source planetarium for your computer.
Grafomap - A map poster of your favourite place on earth
SkEye - SkEye is an advanced Planetarium that can also be used as a PUSHTO guide for telescopes.
TiltMaps - Create map posters of your favorite places & memories.