Telestory
Kids will have a ball with this free app. Record Newscast, Weather Reports, Videos, and much more.
https://itunes.apple.com/us/app/telestory/id915378506?mt=8
DIY Lake Science
http://www.lawrencehallofscience.org/do_science_now/diy_lake_science
Free app allows users to investigate lakes and other freshwater ecosystems. Twelve hands on activities.
Switch Zoo App
https://itunes.apple.com/us/app/switch-zoo-free/id564900502?mt=8