Here is a collection of iPad apps and web tools for language arts, science and social studies.
Free Android Phone app: https://play.google.com/store/apps/details?id=com.socrative.teacher
Free iPad app: https://itunes.apple.com/us/app/teacher-clicker-socrative/id477620120?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/teacher-clicker-socrative/id477620120?mt=8&uo=4&at=10l6SU
Website: http://www.socrative.com/
Edmodo app: http://www.edmodo.com/publisher/socrative
Google Chrome app: https://chrome.google.com/webstore/detail/socrative-teacher/ofajgnplnindhnhnconjocimijjifaln?hl=en
Free Android Phone app: https://play.google.com/store/apps/details?id=com.masteryconnect.CommonCore
Free iPad app: https://itunes.apple.com/us/app/common-core-standards/id439424555?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/common-core-standards/id439424555?mt=8&at=10l6SU
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.masteryconnect.CommonCore
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 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.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.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
Google Chrome app: https://chrome.google.com/webstore/detail/gajclnhcflhoicggnpmgkedchldikjgn
Free iPad app: http://itunes.apple.com/us/app/voicethread/id465159110?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/voicethread/id465159110?mt=8&uo=4&at=10l6SU
Website: http://voicethread.com/
Website: http://www.wordle.net/
Free Mac program: https://prezi.com/desktop/
Free Windows program: https://prezi.com/desktop/
Website: https://prezi.com/
Google Chrome app: https://chrome.google.com/webstore/detail/prezi/acoonfmhnndodekhecidldfdjgooefpg
Google Chrome app: https://chrome.google.com/webstore/detail/blagfjlaoclobammihbopbeppjefpehl
Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=3516+2841472664351178324
Free iPad app: http://itunes.apple.com/us/app/sliderocket-player/id462996758?mt=8&uo=4&at=10l6SU
Website: http://www.sliderocket.com/
Free Mac program: http://www.techsmith.com/download/jing/default.asp
Free Windows program: http://www.techsmith.com/download/jing/default.asp
Website: https://www.turnitin.com/
Edmodo app: http://www.edmodo.com/publisher/turnitin1
Paid Mac program: https://itunes.apple.com/us/app/imovie/id408981434?mt=12&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/imovie/id377298193?mt=8&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/imovie/id377298193?mt=8&at=10l6SU
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 iPad app: https://itunes.apple.com/us/app/showme-interactive-whiteboard/id445066279?mt=8&uo=4&at=10l6SU
Website: http://www.showme.com/
Website: https://quizlet.com/
Edmodo app: http://www.edmodo.com/publisher?uid=507204
Free iPhone app: https://itunes.apple.com/us/app/quizlet/id546473125?mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/quizlet/bgofflgeghkhocbociocnckocbjmomjh
Free Android Phone app: https://market.android.com/details?id=com.evernote.skitch
Free iPad app: http://itunes.apple.com/app/skitch-for-ipad/id490505997?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/app/skitch-for-ipad/id490505997?mt=8&uo=4&at=10l6SU
Free Mac program: http://itunes.apple.com/app/skitch/id425955336?mt=12&uo=4&at=10l6SU
Website: http://www.easybib.com/
Free iPhone app: http://itunes.apple.com/us/app/easybib/id436768184?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.easybib.easybibandroid
Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=6357+7423325443125160988
Google Chrome app: https://chrome.google.com/webstore/detail/cbpiiblghhnlalifiaddecedaeaijdpe
Paid iPhone app: https://itunes.apple.com/us/app/pages/id361309726?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/pages/id361309726?mt=8&uo=4&at=10l6SU
Paid Mac program: http://itunes.apple.com/us/app/pages/id409201541?mt=12&uo=4&at=10l6SU
Paid Mac program: https://itunes.apple.com/us/app/keynote/id409183694?mt=12&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/keynote/id361285480?mt=8&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/keynote/id361285480?mt=8&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 iPad app: http://itunes.apple.com/us/app/idea-sketch/id367246522?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/idea-sketch/id367246522?mt=8&uo=4&at=10l6SU
Paid iPad app: http://itunes.apple.com/us/app/soapbox-social-presentations/id492029429?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.zite
Free iPad app: http://itunes.apple.com/us/app/zite/id419752338?mt=8&ls=1&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/zite/id419752338?mt=8&ls=1&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/screenchomp/id442415881?mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/toontastic/id404693282?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/toontastic-all-access/id563403725?mt=8&uo=4&at=10l6SU
Website: http://todaysmeet.com/
Website: https://noredink.com/
Website: http://www.thinglink.com/
Free iPad app: https://itunes.apple.com/us/app/thinglink/id647304300?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/thinglink/id647304300?mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/id418451914?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/id418451914?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=fm.audioboo.application
Free iPad app: http://itunes.apple.com/app/audioboo/id305204540?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/app/audioboo/id305204540?mt=8&uo=4&at=10l6SU
Website: http://audioboo.fm/
Free iPad app: http://itunes.apple.com/us/app/puppet-pals-hd/id342076546?mt=8&uo=4&at=10l6SU
Website: http://knowmia.com/
Website: http://learni.st/
Free iPad app: https://itunes.apple.com/us/app/learnist/id522850398?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/learnist/id522850398?mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/teach/id527216211?mt=8&uo=4&at=10l6SU
Paid iPad app: http://itunes.apple.com/my/app/teachers-tech/id493891370?mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/my/app/teachers-tech/id493891370?mt=8&uo=4&at=10l6SU
Website: https://storybird.com/
Free iPad app: https://itunes.apple.com/us/app/id412443803?mt=8&at=10l6SU
Paid Windows program: https://doceri.com/win_doceri.php
Paid Mac program: https://doceri.com/download_form.php
Website: https://www.slideshark.com/
Free iPad app: http://itunes.apple.com/us/app/slideshark-view-share-presentations/id471369684?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/slideshark-view-share-presentations/id471369684?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/ibooks/id364709193?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/ibooks/id364709193?mt=8&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/creative-book-builder/id451041428?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/creative-book-builder/id451041428?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/storylines/id464977336?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/storylines/id464977336?mt=8&uo=4&at=10l6SU
Edmodo app: https://www.edmodo.com/store/app/storylines-pages-0-1
Free iPad app: https://itunes.apple.com/us/app/inspiration-maps-lite/id510031612?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/inspiration-maps/id510173686?ls=1&mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/inspiration-maps-lite/id510031612?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/inspiration-maps/id510173686?ls=1&mt=8&uo=4&at=10l6SU
Website: http://www.slideshare.net/
Free iPad app: https://itunes.apple.com/us/app/subtext/id457556753?mt=8&ign-mpt=uo%3D4&uo=4&at=10l6SU
Edmodo app: http://www.edmodo.com/publisher/subtext
Free Android Phone app: https://play.google.com/store/apps/details?id=com.animoto.android.videoslideshow
Free iPhone app: https://itunes.apple.com/app/animoto-videos/id459248037?mt=8&uo=4&at=10l6SU
Website: http://animoto.com/