Triptico

Triptico is a great set of resources developed for teachers, and they are free!  I added the premium membership last year for around $24, mostly to add the student group app, which will automatically create student groups for you.  Two other apps I can't live without at this point: Student Selector PLUS, which will randomly select a student from your group and the Circle Timer, which will visually show your students how much time is left in an activity.

This resource is a great one for ALL grade levels.

Get the free download here:  http://www.triptico.co.uk/