Gil Fronsdal describes the hindrance of ill will, including anger and aversion, and describes some strategies for relating to aversion. You can find his article here: The Hindrance of Ill Will
Thanissara, a Buddhist teacher and social activist, talks about the importance of anger and the ways in which it can help wake us up to the dangers that exist in the world and to try to take action to make the world a better place. Anger needs to be treated with care, and she also discusses the dangers of hanging on to anger or acting from it. You can find her article here: Don’t Worry, Be Angry