Class DOJO - https://www.classdojo.com/
ClassDojo helps teachers improve behavior in their classrooms quickly and easily. It captures and generates data on behavior that teachers can share with parents and administrators. Beautiful reports and easy classroom managment are all built in and everything syncs across all of your devices.
Team Shake helps teachers to partner students and choose teams. Instead of a hat and scraps of paper, the user enters names in the app and give it a shake. The screen will then display a random set of color-coded teams. These teams can immediately be used for game play or saved via email.
Plickers - https://www.plickers.com/
Plickers let you poll your class for fee, without the need for student devices. Just give each student a card (a "paper clicker), and use your device to scan them to do instant checks-for-understanding, exit tickets, and impromptu polls. Data is automatically saved, student-by-student, at plickers.com.