These are all companies and products where at least one founder is or was a teacher. If I am missing any tools here, let me know. This list is constantly being updated.
Benjamin Berte
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
Keith Mukai
Website: http://www.essaytagger.com/
Sam Chaudhary
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
Greg McDonald
Paid iPad app: https://itunes.apple.com/us/app/planet-lettra-word-building/id992464990?mt=8&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/planet-lettra-word-building/id992464990?mt=8&at=10l6SU
Matt Nupen & Karin Hogen
Google Chrome app: https://chrome.google.com/webstore/detail/insertlearning/dehajjkfchegiinhcmoclkfbnmpgcahj
James Willcox
Website: http://www.schoolzilla.org/
Matt Bardin
Website: http://www.zinclearninglabs.com/
Farbood Nivi
Google Apps for Education app: https://www.google.com/enterprise/marketplace/viewListing?productListingId=6161+5711044474433790362
Website: https://grockit.com/
Alex Grodd
Website: http://betterlesson.com/
Sebastian Thrun
Website: http://www.udacity.com/
Daphne Koller & Andrew Ng
Website: https://www.coursera.org/
Daniel Yoo & Justin Su
Website: https://goalbookapp.com/
Matt Hardy
Website: http://kidblog.org/
Jeff Scheur
Website: https://noredink.com/
Jennifer Medbery
Website: http://www.kickboardforteachers.com/
Edmodo app: http://www.edmodo.com/publisher/kickboard
Aliya Bhatia, Ana María de Vries & Grace Landrieu
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
Dr. Deborah Hardy
Website: http://schoolcounselorcentral.com/
Eric Westendorf
Website: http://learnzillion.com/
Francisco Nieto & Reina Cabezas
Website: http://readwithmeapp.com/
Paid iPad app: https://itunes.apple.com/us/app/read-with-me-fluency/id635704413?mt=8&uo=4&at=10l6SU
Adam Bellow
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
Dr. Martin Bush
Website: https://quizslides.com
Lisa Lantz
Paid iPad app: http://itunes.apple.com/us/app/fluencyfinder/id537046445?ls=1&mt=8&uo=4&at=10l6SU
Paid iPhone app: http://itunes.apple.com/us/app/fluencyfinder/id537046445?ls=1&mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.LGG.FluencyFinder
Kasey Brown
Website: http://digitwhiz.com/
Free iPad app: http://itunes.apple.com/us/app/digitwhiz-math/id559968556?mt=8&uo=4&at=10l6SU
Mandela Scumacher-Hodge
Website: http://tioki.com/
Tess Brustein
Website: http://www.beasmartercookie.com/
Free iPad app: https://itunes.apple.com/us/app/smartercookie-uploader/id663608148?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/smartercookie-uploader/id663608148?mt=8&at=10l6SU
Sarah Chou
Website: http://chalkschools.com/
James Sanders & Esther Wojcicki
Website: http://www.classbadges.com/
Adam Geller
Website: https://www.edthena.com/
Free iPhone app: https://itunes.apple.com/us/app/edthena/id1059215018?mt=8&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/edthena/id1059215018?mt=8&at=10l6SU
Al Rogers & Yvonne Marie Andres
Website: http://www.globalschoolnet.org/
Karim Kai Ani
Website: http://www.mathalicious.com/
Nolan Amy
Website: https://plickers.com/
Free iPhone app: https://itunes.apple.com/us/app/plickers/id701184049?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.plickers.client.android
Jocelyn Leavitt
Free iPad app: https://itunes.apple.com/us/app/daisy-the-dinosaur/id490514278?mt=8&uo=4&at=10l6SU
Jeffrey Dionne
Website: http://www.pikifriends.net/
Justin Holladay
Free iPad app: https://itunes.apple.com/us/app/5-dice-order-operations-game/id572774867?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/5-dice-order-operations-game/id572774867?mt=8&uo=4&at=10l6SU
Harsh Patel
Website: https://www.portfoliyo.org/
Shawn Rubin
Free iPad app: http://mymetryx.com/
Russel Tarr
Max Sack & Mark McDonald
Website: https://kikutext.com/
Quentin Donnellan
Website: http://www.lessonwell.com/
Scott Messinger & Robbie Earle
Website: http://www.commoncurriculum.com/
Greg Nussbaum
Website: http://mrnussbaum.com/allgames/
Karen Garrett
Website: http://www.musictechteacher.com/music_quizzes/music_quizzes.htm
Coolmath Karen (real name not given)
Website: http://coolmath4kids.com/
Colleen King
Website: http://www.mathplayground.com/
Reed Howard
Website: http://wowzers.com/
Dr. Louise Waters
Website: http://exitticket.org/
Jocelyn Leavitt
Free iPad app: https://itunes.apple.com/us/app/hopscotch-programming-designed/id617098629?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/hopscotch-programming-designed/id617098629?mt=8&uo=4&at=10l6SU
Julia Leonard
Website: http://www.mathworksheetsland.com/
Dr. Keith Devlin, Randy Weiner, & Pamela Briskman
Free iPad app: https://itunes.apple.com/us/app/wuzzit-trouble/id600190128?mt=8&uo=4&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/wuzzit-trouble/id600190128?mt=8&uo=4&at=10l6SU
Jason Orbaugh
Website: https://taught.it/
Karen Mahon
Website: http://www.balefirelabs.com/
Eric Marcos
Website: http://mathtrain.tv/
Eric Marcos
Website: http://studentcreated.tv/
Walter Duncan
Website: http://www.quickkeyapp.com/
Free iPhone app: https://itunes.apple.com/us/app/id686229501?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.kiteknology.quickkey
Miriam Altman & Alexandra Meis
Website: http://www.kinvolved.com/
Ben Levy
Website: https://www.playposit.com/
Google Chrome app: https://chrome.google.com/webstore/detail/educanon-interactive-vide/lnjmoiijkgfmefmkakinejkfjgampbjh
Jim Burke
Website: http://englishcompanion.ning.com/
Steve Fortna
Website: http://flippity.net/
Justin Mann
Website: http://letsgeddit.com/
Quim Sabrià
Website: http://edpuzzle.com/
Free iPad app: https://itunes.apple.com/us/app/edpuzzle/id919598209?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/edpuzzle/id919598209?mt=8&at=10l6SU
Google Chrome app: https://chrome.google.com/webstore/detail/edpuzzle/aibecpgimejiilcodkhopfpbelohhppf
Suzanne Munroe
Website: http://www.phonicslist.com/
Maya Goodall
Free iPad app: https://itunes.apple.com/us/app/tem/id621180485?mt=8&uo=4&at=10l6SU
Gordon Hamilton
Website: http://www.mathpickle.com/
Hajj Womack
Paid iPhone app: https://itunes.apple.com/us/app/teachersintouch/id680460294?mt=8&uo=4&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.ist.teachersintouch
Susan Bearden
Paid iPad app: https://itunes.apple.com/us/app/tweechme/id885476535?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/tweechme/id885476535?mt=8&uo=4&at=10l6SU
Paid Android Phone app: https://play.google.com/store/apps/details?id=com.crescerance.Protweechme
Mariah Bruehl
Website: http://playfullearning.net/
David Powell
Paid iPad app: https://itunes.apple.com/us/app/music-history-flashcards/id819976888?mt=8&uo=4&at=10l6SU
Paid iPhone app: https://itunes.apple.com/us/app/music-history-flashcards/id819976888?mt=8&uo=4&at=10l6SU
Alan Witty
Free Windows program: http://www.aristotl.com/
Katy Hite, Amy Killebrew, Elizabeth Ludemann, Allison Parker, & Vicki Rakowski
Website: http://makeitatyourlibrary.org/
Ben Crossett
Website: http://www.anatomyarcade.com/games/WAB/WAB.html
Paid iPad app: https://itunes.apple.com/us/app/whack-a-bone/id510533071?mt=8&uo=4&at=10l6SU
Jason Singer
Website: https://www.waterford.org/curriculet/
Brian Aspinall
Website: http://www.edmettle.com/
Dr. Michael Bell & Carole Bell
Website: http://www.kidtopia.info/
Joel Levin & Santeri Koivisto
Paid Mac program: http://minecraftedu.com/page/purchase
Paid Windows program: http://minecraftedu.com/page/purchase
Andrea Rincon
Website: http://123spanishforme.com/
Charles P. McKeague
Website: http://www.mathtv.com/
Libby Curran
Paid iPhone app: https://itunes.apple.com/us/app/id962171685?mt=8&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/id962171685?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/reading-train-free-learn-to/id702227884?mt=8&at=10l6SU
Free iPad app: https://itunes.apple.com/us/app/reading-train-free-learn-to/id702227884?mt=8&at=10l6SU
Matt Nupen & Karin Hogen
Google Chrome app: https://chrome.google.com/webstore/detail/refine/npilhaamcjahflafelbfpmmfcihoiian
Teri Blumenthal
Free iPad app: https://itunes.apple.com/us/app/id986937199?mt=8&at=10l6SU
Paid iPad app: https://itunes.apple.com/us/app/clue-catcher-all-grades-edition/id1087685228?mt=8&at=10l6SU
Julia Franks
Website: https://loosecanon.com/