Classroom Activities
Examples of Active Learning Activities from Queens University in Canada is an excellent resource that is grouped into the size of the group (large groups, small groups and individuals). When you click on one of the groups it provides a list of activities and when you click on an activity it explains below what that activity is, how it works, how much time you need, for how many students and some of its rationale. This is excellent for helping you plan your class.
Group Work in the Classroom: Types of Small Groups from the Centre for Teaching Excellence at the University of Waterloo provides a list of teaching activities that details the class size, time needed, limitations and its purpose/rationale, as well as a description of the activity, and some of the difficulties you may encounter.