As of January of 2018, there were over 100 contributors, with thousands of forks. 
The contract allows users to implement the frameworks created by the Zeppelin team.
These contracts allow users to pause/unpause contracts, terminate them and destroy tokens.
These solidity files allow users to perform math functions needed to create and issue tokens. 
If the creator of the contract wishes to transfer ownership of the contract, they are able to do so with these methods. Additionally, they can set the contract to transfer to an heir upon the original contract owner's death.
This element can pose serious security risks by allowing ownership to be transferred to a malicious actor, potentially resulting in a loss of funds.