OpenZeppelin Contracts

OpenZeppeling Contracts is another blockchain framework that helps you build smart contracts by using trusted libraries and by providing you with the most widely used implementations of ERC standards. It offers high-security levels, a modular approach to build robust code, and reusable Solidity components for you to create complex systems and custom contracts. 

A Zeppelin is a type of rigid airship named after the German inventor Count Ferdinand von Zeppelin (German pronunciation: [ˈt͡sɛpəliːn]) who pioneered rigid airship development at the beginning of the 20th century. Zeppelin's notions were first formulated in 1874 and developed in detail in 1893.