With the iNaturalist App, you can take photos of different species and tag their locations to contribute to a global database and connect with nature enthusiasts and researchers around the world.

This is provided by Literatti.org. It lets you arrange a garbage clean up, and use the app to automatically collect, map, & visualize data so you can demonstrate your impact.

Aurora Forecast 3D is a tool that shows where the aurora is located in the sky from any location on earth. It renders Earth in 3D with rotation and scaling at your fingertips. Get it in the Apple App Store, or from Google Play.