OpenZeppelin Contracts is a library for secure smart contract development.

Guidelines and training material to write secure smart contracts

Web3/Solidity based wargame

weird erc20 tokens

The smart contract security training ground for developers, security researchers and educators.

Loose collection of Solidity example code

Solidity implementation of the Frax Protocol

Smart contracts that powers the PoS (proof-of-stake) based bridge mechanism for Matic Network

Open-source NFT contracts used by Buildship

Cross-chain EVM-based token data.

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RVOL makes on-chain volatility data accessible