From Hasidic Anthology by Louis I. Newman, on Anger:

Delay Your Wrath

The Gastininer Rabbi made it a rule for himself never to express his displeasure with anyone on the same day when he was offended by that person. On the morrow he would say to the man: "I was displeased with you yesterday."

The Example of Self-Restraint

Rabbi Leib Saras said: "Of what avail is mere study of the Teachings when he who learns is contaminated by pride and temper? The good man should himself be the Teaching, and people should be able to learn good conduct from him."

More Pleasing Than Fast Days

The Sassover said: "If thy neighbor offend thee, refrain from wrath and it will bee more pleasing in the sight of God than a thousand fast-days; listen to revilings without retort, and it will stand you in stead of a thousand self-inflictions."

Patience Under Annoyance

The Vorker Rabbi said: " The truly humble man is unable to feel anger. Even if he is interrupted when busy, he will show no annoyance. He always believes the other man to be more important than himself."

The Bratzlaver on "Anger"

 1. Break your anger by compassion for the one with whom you are angry.

 2. Angry and cruelty arise from a deficiency of understanding. Study the teachings to improve your understanding.

 3. He who is obsessed by anger loses his image of God.

 4. Abstinence from food is oftentimes a corrective of anger.

 5. Anger prevents God's abundance from descending to us. 

 6. He who subdues his anger achieves a good name.

 7. Anger causes a man to be far from the truth.

 8. An angry man cannot pray properly.

 9. An angry man cannot attain the goal to which he aspires.