Paid iPhone app: https://itunes.apple.com/us/app/my-measures-dimensions/id325962257?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/my-measures-dimensions/id325962257?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
Website: http://www.nationalgeographic.com/
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/
Paid iPad app: https://itunes.apple.com/us/app/id431493086?mt=8&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/id431493086?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.explaineverything.explaineverything
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.explaineverything.explaineverything
Google Chrome app: https://chrome.google.com/webstore/detail/explain-everything/abgfnbfplmdnhfnonljpllnfcobfebag
Free iPad app: https://itunes.apple.com/us/app/calculator-for-ipad-free/id398129933?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/calculator-for-ipad/id396082453?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/quick-graph-your-scientific/id292412367?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/quick-graph-your-scientific/id292412367?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/quick-graph+-your-scientific/id541477533?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/quick-graph+-your-scientific/id541477533?mt=8&uo=4&at=10l6SU
Website: http://dictionary.com
Google Chrome app: https://chrome.google.com/webstore/detail/dictionary-by-dictionaryc/gikhgcaliglmioibbockkmjknfnepbdh