Do you have any recommendation for an open source (source code available) bitcoin / crypto coin wallet?

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There are plenty in bithub. I cannot recommend any one in particular. Depends on what you are going to use it for. So why do you need a source code of a wallet? There are plenty available. Both soft and hard wallets and each coin has its own wallet available for free.
Oh, I see. Please go to GitHub and search for Bitcoin wallet. There, you will be able to download source code and modify it as needed. All of the stuff on GitHub is open source.
I advise you to look at Github I'm sure you will find there what u r looking for