Favorite Apps for Environmental Education and Outdoor Learning?

Time to take technology outdoors?
What are your favorite apps to enhance environmental literacy and outdoor learning?
Here's a list of my favorite Apps for Environmental Education/Outdoor Learning, optimized to include online guides for Virginia plants and wildlife see http://bit.ly/1KK4PnJ

Using app LikeThat Garden for flower identification

The list includes useful apps and links to identify plants, birds and animals and design gardens - wherever you have cellular connectivity!

Comments? Additions?