General:
* Stops
* Ends
* Finishes
* Halts
* Terminates
* Discontinues
* Concludes
* Abates
* Subsides
More formal:
* Disbands
* Ceases to exist
* Is extinguished
* Is brought to a close
More informal:
* Kicks the bucket (for death)
* Calls it a day
* Quits
* Gives up
Other options:
* Diminishes
* Fades
* Wanes
The best word to use depends on the specific situation. For example, "stops" would be a good choice for something that is simply stopping, while "terminates" might be better for something that is ending officially.