Ethereum Foundation

The Ethereum Foundation's account abstraction team, ETH Infinitism, developed a few reference contracts as part of the development of ERC-4337.

• SimpleAccount.sol - an account with one owner that verifies a single ECDSA signature. This is used in Stackup's Quickstart Example.
• BLSAccount.sol - account with one owner that verifies BLS signatures

Standalone

• ZeroDev Kernel - A modular smart account implementation by ZeroDev. Audited in April 2023.
• Rhinestone - Designed to have a plugin ecosystem and based on the Diamond pattern. In progress.
• Permissive - Framework for managing on-chain authorization compatible with Rhinestone and Gnosis Safe. Early version is live.
• Soul Wallet - Developed for Soul Wallet. In progress, expected Q4 2023.

Gnosis Safe Based

Safe (previously Gnosis Safe) is a popular smart contract wallet library that can be modified to be ERC-4337 compliant.

• GnosisAccountFactory.sol - A demo ERC-4337 compatible Gnosis Safe by the Ethereum Foundation
• Candide Wallet - A direct Gnosis Safe fork for ERC-4337, plus a social recovery module
• ZeroDev's Gnosis Safe - A direct Gnosis Safe fork for ERC-4337