These are apps I use to organize my classroom/teaching.
Free Android Phone app: https://play.google.com/store/apps/details?id=com.dropbox.android
Google Chrome app: https://chrome.google.com/webstore/detail/ioekoebejdcmnlefjiknokhhafglcjdl
Free iPad app: http://itunes.apple.com/us/app/dropbox/id327630330?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/dropbox/id327630330?mt=8&uo=4&at=10l6SU
Free Mac program: https://www.dropbox.com/downloading?os=mac
Free Windows program: https://www.dropbox.com/downloading?os=win
Website: https://db.tt/dUahryRn
Free Android Phone app: https://play.google.com/store/apps/details?id=com.threering.threering
Free iPhone app: http://itunes.apple.com/us/app/three-ring/id504311049?mt=8&uo=4&at=10l6SU
Website: http://threering.com/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.evernote
Google Chrome app: https://chrome.google.com/webstore/detail/pioclpoplcdbaefihamjohnefbikjilc
Mozilla Firefox extension: https://addons.mozilla.org/en-US/firefox/addon/evernote-web-clipper/
Free iPad app: http://itunes.apple.com/us/app/evernote/id281796108?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/evernote/id281796108?mt=8&uo=4&at=10l6SU
Free Mac program: http://itunes.apple.com/us/app/evernote/id406056744?mt=12&uo=4&at=10l6SU
Apple Safari extension: http://evernote.com/download/get.php?file=SafariExtension
Free Windows program: http://evernote.com/download/get.php?file=Win
Website: http://www.evernote.com/
Free Android Phone app: https://play.google.com/store/apps/details?id=com.google.android.apps.docs
Google Chrome app: https://chrome.google.com/webstore/detail/google-drive/apdfllckaahabafndbhieahigkjlhalf
Free iPad app: https://itunes.apple.com/us/app/google-drive/id507874739?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/google-drive/id507874739?mt=8&uo=4&at=10l6SU
Website: http://drive.google.com/
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.google.android.apps.docs
Free Mac program: https://www.google.com/drive/download/
Free Windows program: https://www.google.com/drive/download/
Website: https://educlipper.net/
Free iPhone app: https://itunes.apple.com/us/app/educlipper/id737584066?mt=8&uo=6&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/educlipper/id737584066?mt=8&uo=6&at=10l6SU
Website: http://delicious.com/
Website: http://www.classdojo.com/
Free iPad app: http://itunes.apple.com/us/app/classdojo/id552602056?ls=1&mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/classdojo/id552602056?ls=1&mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.classdojo.android
Google Chrome app: https://chrome.google.com/webstore/detail/pbinoojbbajacmkigmfnkclhgjnglpon
Free Android Phone app: https://play.google.com/store/apps/details?id=com.fusionprojects.edmodo
Free iPad app: http://itunes.apple.com/us/app/edmodo/id378352300?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/edmodo/id378352300?mt=8&uo=4&at=10l6SU
Website: http://www.edmodo.com/
Google Chrome app: https://chrome.google.com/webstore/detail/edmodo/fpcdidgjjebefhmlhjlgnkahlimgaemc
Website: http://www.flickr.com/
Website: http://www.classbadges.com/