OpenZeppelin Contracts is a library for secure smart contract development.

Web3/Solidity based wargame

(Aragon 1) Reference implementation for aragonOS: a Solidity framework for building complex dApps and protocols

On chain interactive fault prover for Ethereum

ERC-223 token standard reference implementation.

CREATE3 (see EIP-3171) implemented in Solidity

Useful sample code for various Ethereum smart contracts

A public utility ERC20 for creating & claiming transparent proxies with gas-efficient addresses.

On-chain, non-transferrable badges for rewarding GitHub contributions.

Bitcoin implemented as a token smart contract on Ethereum.

Account Abstraction smart contract accounts, modules, audits, tests, and formal verification

A library for encoding CBOR in Solidity.

Pure-solidity implementation of the SHA1 hash function.

Novel zero-knowledge proof based social recovery of smart contract wallets

Gradle plugin providing tasks to compile Solidity contracts.

Yoga Token

Blacklisting tools for ENS

generic optimistic smart contract

Idena Ethereum Relay Contract

zkTripster: Time Release Incentive Platform for Security Threats Ethical Reporting

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Web3-enabled Harbergeorgism

bounty kings contracts

An Ethereum Relayer for The Idena Blockchain