Will be adding more as needed. :) Enjoy my suggestions!
Free iPhone app: https://itunes.apple.com/us/app/motion-math-wings/id508228412?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/motion-math-wings/id508228412?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/motion-math-pizza!/id743031884?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/motion-math-pizza!/id743031884?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/number-rack-by-math-learning/id496057949?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/number-rack-by-math-learning/id496057949?mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/number-rack-by-the-math-l/pdblapgbfbphhldogcijidlkbcgokfkc
Website: http://www.mathlearningcenter.org/web-apps/number-rack/
Website: http://www.mathlearningcenter.org/web-apps/number-line/
Free iPad app: https://itunes.apple.com/us/app/number-line-by-math-learning/id751816884?mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/number-line-by-the-math-l/ociighkhkffcoplfkofojilfjholclge?utm_source=chrome-ntp-icon
Free iPhone app: https://itunes.apple.com/us/app/geoboard-by-math-learning/id519896952?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/geoboard-by-math-learning/id519896952?mt=8&uo=4&at=10l6SU
Website: http://www.mathlearningcenter.org/web-apps/geoboard/
Google Chrome app: https://chrome.google.com/webstore/detail/geoboard-by-the-math-lear/gaakmmdiopnmcenkojohldanladpajak
Free iPad app: https://itunes.apple.com/us/app/number-pieces-by-math-learning/id605433778?mt=8&uo=4&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/number-pieces-by-the-math/fhcpnppigjdhghbohcbogmmhmfkobgbm
Website: http://www.mathlearningcenter.org/web-apps/number-pieces/
Free iPad app: https://itunes.apple.com/us/app/number-pieces-basic-by-math/id611452042?mt=8&uo=4&at=10l6SU
Website: http://www.mathlearningcenter.org/web-apps/number-pieces/
Free iPad app: https://itunes.apple.com/us/app/fraction-circles/id432573171?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/questimate!/id610665063?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/math-monsters-bingo/id452985193?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/math-monsters-bingo/id452985193?mt=8&uo=4&at=10l6SU
Website: https://www.splashmath.com/
Paid iPad app: https://itunes.apple.com/us/app/math-heroes-1-basic-operations/id542601241?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/math-heroes-1-basic-operations/id542601241?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/singapore-math-bar-models/id461710600?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/number-crush/id744822983?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/number-crush/id744822983?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/app/math-champ-challenge-common/id566463831?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/app/math-champ-challenge-common/id566463831?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/column-addition/id339440193?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/column-addition/id339440193?mt=8&uo=4&at=10l6SU
Paid Windows program: https://www.microsoft.com/en-us/store/p/column-addition/9n8hg48g7ds1
Paid iPad app: https://itunes.apple.com/us/app/fx-algebra-for-education/id832318465?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/fx-algebra-for-education/id832318465?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/fluidgraphfree/id598654407?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/fluidgraph-2014/id631425247?mt=8&uo=4&at=10l6SU
Website: http://www.mathalicious.com/
Paid Mac program: http://www.softmath.com/ordering-algebra.html
Paid Windows program: http://www.softmath.com/ordering-algebra.html
Free iPad app: http://itunes.apple.com/us/app/motion-math-hungry-fish/id483049169?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-hungry-fish/id483049169?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/motion-math-hungry-guppy/id542563075?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/motion-math-hungry-guppy/id542563075?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/motion-math-hd/id410521340?mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/motion-math/id392489333?mt=8&uo=4&at=10l6SU
Edmodo app: http://www.edmodo.com/publisher/motionmath
Free iPad app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: http://itunes.apple.com/us/app/motion-math-zoom/id451793073?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/oktas-rescue/id465480278?mt=8&uo=4&at=10l6SU
Website: http://illuminations.nctm.org/ActivityDetail.aspx?ID=219
Free Android Phone app: https://play.google.com/store/apps/details?id=air.com.learningtoday.octopusAndroid2
Website: http://illuminations.nctm.org/ActivityDetail.aspx?ID=207
Free iPad app: https://itunes.apple.com/us/app/deep-sea-duel/id547246887?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/deep-sea-duel/id547246887?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=air.AndroidPublish
Free iPad app: https://itunes.apple.com/us/app/pearl-diver-hd/id364617763?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/pearl-diver/id337567843?mt=8&at=10l6SU
Website: http://mathsnacks.com/pearl-diver-en.html
Free iPad app: https://itunes.apple.com/us/app/lobster-diver-hd/id416610863?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/door-24-math/id770879638?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/native-numbers-lite-number/id593188849?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/native-numbers-complete-number/id570231808?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/number-frames-by-math-learning/id873198123?mt=8&uo=6&at=10l6SU
Website: http://www.mathlearningcenter.org/web-apps/number-frames/
Google Chrome app: https://chrome.google.com/webstore/detail/number-frames-by-the-math/idlcfdihcafblaoadpfeofbcbcmfogbc
Website: http://www.tenbyten.org/
Free iPad app: https://itunes.apple.com/us/app/math-word-problems-addition/id703753981?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/math-word-problems-addition/id698772777?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/math-doodles/id526959716?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/sums-stacker/id343251346?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/connect-sums-math-doodles/id555216734?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/hands-on-math-base-ten-blocks/id477991440?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/pick-a-path/id545185507?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/pick-a-path/id545185507?mt=8&uo=4&at=10l6SU
Website: http://www.fuelthebrain.com/
Paid iPad app: https://itunes.apple.com/us/app/montessori-place-value/id408285618?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/montessori-numbers-for-kids/id547209737?ls=1&mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/montessori-numbers-for-kids/id547209737?ls=1&mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/partial-differences-subtraction/id351023078?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/partial-differences-subtraction/id351023078?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/beyond-cats!-grade-1-math/id863356883?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/beyond-cats!-grade-1-math/id863356883?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/measure-your-land/id520183630?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/measure-your-land/id520183630?mt=8&uo=4&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/geometry-pad/id517461177?mt=8&uo=4&at=10l6SU
Paid Mac program: http://itunes.apple.com/us/app/numbers/id409203825?mt=12&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/numbers/id361304891?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/numbers/id361304891?mt=8&uo=4&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/mathcubes-addition-subtraction/id864191079?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/mathcubes-addition-subtraction/id864191079?mt=8&uo=4&at=10l6SU