A great website with resources on many topics. 

Under the tab Resources, there are great ideas to help children with anxiety, anger, stress, and other great tools. There are many free resources and also some available for purchase. 

GoZen is a wonderful resource. I use their programs for individual and group support. As a teacher and parent, I find their products extremely useful. They mail out a free weekly printable if you sign up for their emailing list. 

Another website with resources you may find helpful.