General:
* Shouted
* Yelled
* Roared
* Screamed
* Howled
* Boomed
* Cried out
* Exclaimed
More forceful and powerful:
* Thundered
* Rumbled
* Declaimed
* Proclaimed
More informal:
* Hollered
* Yowled
For a specific emotion:
* Moaned (for sadness or pain)
* Sobbed (for deep sorrow)
* Laughed (for joy or amusement)
The best synonym will depend on the specific situation and the tone you want to create.