Flipgrid is a website that allows teachers to create "grids" to facilitate video discussions.
Formative is a web-based student response and assessment tool for the flipped, BYOD, or 1-to-1 classroom.
Google Classroom helps teachers manage workflow and communication with their students (it's available as a website, an Android app, and an iOS app).
Minecraft is a sandbox game that can be adapted to fit nearly any objective or subject, with lessons lasting as short as one period or the entire year.
Showbie is an assignment, submission and grading tool for desktop and mobile devices, tuned to flipped and one-to-one computing classrooms.
Stick Pick is a classroom-management and -assessment app that takes the popsicle-stick-in-a-can concept digital and expands it to help teachers improve the way they ask questions in the classroom.
Classkick lets teachers create and share assignments, monitor students, and give feedback in real time as students work from iPads or computers.
LearnZillion is an online database of short video lessons that address learning topics aligned to individual Common Core standards.
GameMaker Studio 2 is the real deal; its drag-and-drop programming environment allows new game designers to jump right in and create 2D games.
Goalbook Toolkit is an online source for Common Core State Standards-based learning goals and teaching interventions.