Whiteboard.fi is an online whiteboard service specially designed for teachers and classrooms. It can be used as a tool for formative assessment. The teacher creates a "classroom" and a code. The students can log in and answer a question/solve a task. The teacher can see all the answers, the students can only see the questions.
Information:
Main purpose: Resources to use in the classroom, Resources for learners
Languages: English
Available as: App for Android and Windows
Cost: Free