iTestMe is a collaborative Cyber-learning tool that help engage learners and instructors in constructive learning explorations and inquiries delivered in classroom, online, and informal education settings. The tool provides a wide variety of applications including flexible assignments, formative and summative assessment, and real-time polling (clicker function), which are developed based on the current advancement in the learning science to promote learner centered inquiry based education. Using iTestMe, students can conduct self-paced learning to target specific learning needs and to facilitate the completion of a formal course. Teachers can use iTestMe to create an engaging course by transforming the passive classroom into a collaborative setting for peer-based inquiry learning and to deliver effective teaching by utilizing the just-in-time formative assessment. The development of the iTestMe system is overseen by a group of scientists and education researchers at the Ohio State University. For more information, please visit iTest.Me.