Socrative - create quizzes and assess students in real time
Quizlet - create study cards with terms and definitions / images that can be shared with students
Kahoot - game based classroom response system
Plickers - use QR codes and a device to collect student responses in real time
QuizSlides - create tests and quizzes on host them online for students to take, view results online and download on spreadsheets
Geddit - instant student feedback and checks for understanding
GradeCam - use your smart phone, web camera, or document camera to grade student work
AnswerGarden - instant student feedback that creates a wordle
ExitTicket - free and premium versions, student response system
Formative - create assessment, homework, or classwork, receive live results, and give feedback
JeopardyLabs - templates to create online games for assessment / feedback
Edulastic - common core formative assessment, create or reimagine tests aligned to specific standards
The Answer Pad - create formative and summative assessments with instant student feedback
EDpuzzle - create questions inside videos and track responses