Dark Sky - Hyperlocal weather information, now on the web ⛈
Suntimes - Android app (and widget collection) that displays sunlight and moonlight times for a given location.
Tinyclouds - An adorable new weather app for iPhone and iPad
Natural Hour - A roman timekeeping add-on for Suntimes.
CARROT Weather - An eerily accurate weather app with hilarious forecasts
Sol: Sun Clock - Get reminded when it's sunrise or sunset, wherever you travel!