OpenZeppelin

Founded in 2015 with the mission to protect the open economy, OpenZeppelin safeguards tens of billions of dollars in funds for leading crypto organizations including Coinbase, Ethereum Foundation, Compound, Aave, TheGraph, and many others. OpenZeppelin verifies that your distributed systems work as intended by performing an audit and reviewing your system’s architecture and codebase, and then writes a thorough report that includes actionable feedback for every issue found.

Website: https://openzeppelin.com/