Website: https://www.remind.com/
Free iPad app: http://itunes.apple.com/us/app/remind/id522826277?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/remind/id522826277?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.remind101
Google Chrome app: https://chrome.google.com/webstore/detail/jppddpkfhdojffabldnpdacpeoefcljp
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.remind101
Paid iPad app: http://itunes.apple.com/us/app/dash4teachers-connecting-teachers/id529027117?ls=1&mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/dash4teachers-connecting-teachers/id529027117?ls=1&mt=8&uo=4&at=10l6SU
Website: http://cel.ly/
Free iPhone app: https://itunes.apple.com/us/app/celly/id589698991?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.p2.android.celly
Free Android Phone app: https://play.google.com/store/apps/details?id=com.texty.sms
Google Chrome app: https://chrome.google.com/webstore/detail/dkfhfaphfkopdgpbfkebjfcblcafcmpi
Website: http://mightytext.net/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.skype.raider&hl=en
Free iPad app: http://itunes.apple.com/us/app/skype-for-ipad/id442012681?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/skype/id304878510?mt=8&uo=4&at=10l6SU
Free Mac program: http://www.skype.com/go/download
Free Windows program: http://www.skype.com/go/download
Website: http://skype.com/
Free Mac program: http://www.google.com/tools/dlpage/res/talkvideo/hangouts/
Free Windows program: http://www.google.com/tools/dlpage/res/talkvideo/hangouts/
Website: http://www.google.com/tools/dlpage/res/talkvideo/hangouts/
Google Chrome app: https://chrome.google.com/webstore/detail/google%2B-hangouts/kbpgddbgniojgndnhlkjbkpknjhppkbk
Website: http://www.sendhub.com/
Free iPhone app: https://itunes.apple.com/us/app/sendhub/id516986685?ls=1&mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/sendhub-free-business-pho/nlijkadphehijfiiigjeklnlnknmmped
Website: https://twitter.com/
Free iPad app: https://itunes.apple.com/us/app/id333903271?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/id333903271?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.twitter.android
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.twitter.android
Free Mac program: https://itunes.apple.com/us/app/twitter/id409789998?mt=12&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.google.android.apps.plus
Google Chrome app: https://chrome.google.com/webstore/detail/google%20/dlppkpafhbajpcmmoheippocdidnckmm
Free iPad app: https://itunes.apple.com/us/app/google+/id447119634?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/google+/id447119634?mt=8&uo=4&at=10l6SU
Website: http://plus.google.com/