Solaris Sky Calendar - An astronomy calendar right in your pocket
Instagram - Instagram is a mobile, desktop, and Internet-based photo-sharing application and service that allows users to share pictures and videos either publicly, or privately to pre-approved followers.
Sundial App - Sun & Moon times and alerts for iPhone, iPad, & Apple Watch
vu - Dead simple Instagram client for Mac
Alpenglow - Never miss a incredible looking sunrise or sunset again
Grids - Experience Instagram in beautiful ways on desktop