I follow the ancient Lojong practices from the Tibetan Buddhist tradition. I smile to my anger & breathe into it. I may even place my hand over my heart as a sign of my lovingkindness for & acceptance of it. After a few moments I drop the "story line" (the details of what it was I am angry about) & simply stay with the underlying emotion... whatever it is & allow it to fade of its own accord. It is a practice I learned from reading the books of the Buddhist nun Pema Chödrön.