Free Microsoft Tool, Mouse Mischief

Mouse Mischief is a fun way to keep the attention of your audience during a workshop  and increase participation in the session.

This PowerPoint add-in lets each participant use their own mouse to click, circle, cross out, or even draw answers for questions you present with PowerPoint. 

Mouse Mischief also includes instant polling tools, which you can use to encourage discussion and adjust your 
talk based on participants feedback.   

Mouse Mischief