Here are some well-known open source crypto wallets:

1. Electrum: It is an open source Bitcoin wallet with a lightweight design and strong security features. It offers backup and recovery capabilities, multiple authentication options, and hardware wallet integration

1. MyEtherWallet (MEW): It is an open source Ethereum wallet that provides an easy-to-use interface for managing Ethereum and its related tokens. It supports offline transaction signing, hardware wallet integration, and multiple authentication options

1. Exodus: is a desktop wallet that supports multiple cryptocurrencies with a user-friendly interface and backup capabilities. It uses open source underlying technology and provides built-in trading functions and market data

1. Trust Wallet: It is an open source mobile wallet that supports multiple blockchain platforms, such as Ethereum, Binance Smart Chain, etc. It features a user-friendly interface, hardware wallet integration, and built-in DApp browser