These third-party open source contracts have been used in production by various projects without incident. They are used to power multisender, staking pools and token creation.

stakingRewards.sol

developer.synthetix.io/contracts/source/contracts/StakingRewards/

ERC20.sol

github.com/OpenZeppelin/openzeppelin-contracts/tree/master/contracts/token

disperse.sol

disperse.app/disperse.pdf

GasliteDrop.sol

GasliteDrop.sol