Website: http://phet.colorado.edu/
Website: http://www.instructables.com/
Free Mac program: http://sketchup.google.com/
Free Windows program: http://sketchup.google.com/
Free iPad app: http://itunes.apple.com/app/tinkerbox-hd/id415722219?mt=8&uo=4&at=10l6SU
Free iPad app: http://itunes.apple.com/us/app/molecules/id284943090?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/molecules/id284943090?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/monster-physics-lite/id525417784?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/monster-physics/id505046678?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/monster-physics-lite/id525417784?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/monster-physics/id505046678?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/bridge-constructor-playground/id578203499?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/bridge-constructor-playground/id578203499?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.headupgames.bridgeconstructorplayground
Free Android Phone app: https://play.google.com/store/apps/details?id=com.headupgames.bridgeconstructorplaygroundfree
Free iPad app: https://itunes.apple.com/us/app/autodesk-digital-steam-applied/id605304785?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/aero!/id423650051?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/aero!/id423650051?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/algodoo/id616064935?mt=8&uo=4&at=10l6SU
Free Mac program: http://www.algodoo.com/download/
Paid Mac program: https://itunes.apple.com/us/app/algodoo-physics/id464050545?mt=12&uo=4&at=10l6SU
Free Windows program: http://www.algodoo.com/download/
Paid iPad app: https://itunes.apple.com/us/app/coaster-physics/id393340142?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/coaster-physics/id393340142?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/bridgebasher/id324473106?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/bridgebasher/id324473106?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.andrewgarrison.bridgebasher
Paid iPad app: https://itunes.apple.com/us/app/motion-analyzer/id623638405?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/motion-analyzer/id623638405?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/bill-nye-the-science-guy/id652548755?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/bill-nye-the-science-guy/id652548755?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/powers-of-minus-ten-bone/id591722396?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/powers-of-minus-ten-bone/id591722396?mt=8&uo=4&at=10l6SU
Website: http://www.explorelearning.com/
Free iPad app: https://itunes.apple.com/us/app/phydios/id581649344?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/wind-tunnel-lite/id387302636?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/wind-tunnel-lite/id387302636?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/wind-tunnel/id381971296?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/wind-tunnel/id381971296?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 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
Free iPhone app: https://itunes.apple.com/us/app/idynamic/id496739359?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/idynamic/id496739359?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/geared-for-ipad/id368624362?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/geared/id325793558?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/accelmeter-3d-vector-accelerometer/id346525189?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/accelmeter-3d-vector-accelerometer/id346525189?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/slopro-1000fps-slow-motion/id507232505?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/slopro-1000fps-slow-motion/id507232505?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/vernier-video-physics/id389784247?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/vernier-video-physics/id389784247?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/electrical-toolkit/id301308656?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/electrical-toolkit/id301308656?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/sector-33/id486953105?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/sector-33/id486953105?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=gov.nasa.stem
Free iPhone app: https://itunes.apple.com/us/app/app-control-lite/id413574128?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/app-control-lite/id413574128?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/app-control/id413342926?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/app-control/id413342926?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.vincentlambercy.appcontrol
Free Android Phone app: https://play.google.com/store/apps/details?id=com.vincentlambercy.appcontrollite
Website: http://www.appcontrolgame.com/web-version/
Website: http://www.edheads.org/
Website: http://fantasticcontraption.com/
Paid iPhone app: https://itunes.apple.com/us/app/fantastic-contraption/id302309578?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/123d-design/id567821620?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/construct-a-car/id510004449?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/gravity-app/id373277144?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/gravity-app/id373277144?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/gravity-launch/id599053503?ls=1&mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.redhillstudios.cocos2dxtest
Free iPhone app: https://itunes.apple.com/us/app/hudsonalpha-icell/id364882015?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/hudsonalpha-icell/id364882015?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=org.hudsonalpha.icell
Free iPhone app: https://itunes.apple.com/us/app/mitosis/id348184626?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/earth-school/id525308489?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/earth-school/id525308489?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/create-a-car/id388173036?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/create-a-car/id388173036?mt=8&uo=4&at=10l6SU
Paid iPad app: http://itunes.apple.com/us/app/elements-visual-exploration/id364147847?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/sugar-shake/id598787207?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/goreact/id649585694?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/goreact/id649585694?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/life-of-a-monarch-butterfly/id663140722?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/app/video-coach-ubersense/id470428362?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/app/video-coach-ubersense/id470428362?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.ubersense.app.production
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.ubersense.app.production
Free iPad app: https://itunes.apple.com/us/app/vex-toss-up/id634038919?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/vex-toss-up/id634038919?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/gizmos/id692838319?mt=8&uo=4&at=10l6SU