Free iPad app: http://itunes.apple.com/us/app/itunes-u/id490217893?ls=1&mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/itunes-u/id490217893?ls=1&mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/google-earth/id293622097?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/google-earth/id293622097?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.google.earth
Free Mac program: http://www.google.com/earth/download/
Free Windows program: http://www.google.com/earth/download/
Google Chrome app: http://www.google.com/earth/explore/products/plugin.html
Mozilla Firefox extension: http://www.google.com/earth/explore/products/plugin.html
Apple Safari extension: http://www.google.com/earth/explore/products/plugin.html
Free Android Phone app: https://play.google.com/store/apps/details?id=com.merriamwebster
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.merriamwebster.premium
Free iPad app: https://itunes.apple.com/us/app/merriam-webster-dictionary/id438477986?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/merriam-webster-dictionary/id478132032?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/merriam-webster-dictionary/id399452287?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/merriam-webster-dictionary/id478126577?mt=8&uo=4&at=10l6SU
Website: http://www.merriam-webster.com/
Website: http://dictionary.com
Google Chrome app: https://chrome.google.com/webstore/detail/dictionary-by-dictionaryc/gikhgcaliglmioibbockkmjknfnepbdh
Free iPad app: https://itunes.apple.com/us/app/encyclop-dia-britannica/id447919187?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/encyclop-dia-britannica/id447919187?mt=8&at=10l6SU
Website: https://www.britannica.com/
Website: http://www.ted.com/
Free iPad app: https://itunes.apple.com/us/app/ted/id376183339?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/ted/id376183339?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.ted.android
Free iPad app: http://itunes.apple.com/us/app/destiny-quest/id472689459?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/destiny-quest/id472689459?mt=8&uo=4&at=10l6SU