Mateus Mercer - My Toolbox - Weather & Astronomy

Forecasts, the sky above and where the sun will be

Free

Windy

Interactive weather map with wind, rain, temperature and waves, comparing forecasts from several global models.

It plays a sound with every lightning strike, and on phones it vibrates too, which is very cool. I love the Android home screen widgets.

Open Source

Point your phone at the sky to identify stars, planets and constellations in real time.

I use it at midnight and say: heh, the sun is below me.

Predicts the position of the sun and moon for any place and date, with an AR view for planning photos.

Useful every Math.random() * 50 years, to find the best place to watch a solar eclipse.