I find it hard to "control" my anger. It's a lot easier to walk away, do something else until it subsides, etc. Basically remove myself from the situation. The best thing I've done is simply to lower my stress and magically most of the anger goes away. Regular sleep, exercise, and nutrition can also greatly lower your tendency to do it. Meditation never did much for me, I've tried multitudes of time. Doing things that have me focus on one "simple" task though are wonderful to lower stress and let things percolate in my brain that are frustrating and often I come up with a solution.