Are you looking for open source wallets where to keep your ETH? We made some research to find out good solution you should take into consideration.
MyCrypto is an open source Ethereum wallet for Desktop (Windows, macOS and Linux). Its code is available on GitHub and has been security-audited by Cure53.
MyEtherWallet is available on GitHub and is a client-side interface to interact with the Ethereum blockchain.
EtherWall's source code is on GitHub and is a free wallet software to store Ethereum.
BitPay is a desktop and mobile wallet platform where you can store Bitcoin, Bitcoin Cash, Ethereum and ERC20. The code is on GitHub.
AlphaWallet is a mobile and dApp wallet avaiable as an Android and iOS app. You can find the code repositories on GitHub.
MetaMask is an open source wallet available as a Browser Extension, even on Brave. Its code can be found on GitHub.