I am teaching Calculus I as a flipped class where students watch the calculus videos I've created and then come to class ready to interact with the material.  These activities enable that as students work in groups and share with their peers or we sometimes work together as a class and discuss them.  Many of these activities were taken from the OER book Active Calculus.  At times they have been edited to better fit our curriculum and they've been re-titled.  I have also developed several of these activities.