Electrum and Bitcoin Core are good wallets, non custodial, open source and there are other wallet softwares that are good too.

If you are unsure, you can check wallets with
https://walletscrutiny.com/ check whether a wallet is open source (reproducible or not).
https://bitcoin.org/en/choose-your-wallet choose wallets for your needs.

Any wallet software you want to download and use, verify what you download.

[Guide] Verify and download Electrum wallet
The paranoid user's security guide for using Electrum safely.

Bitcoin Core wallet has guides to verify your download too.