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Bitaddress.org: an open-source, client-side tool for creating Bitcoin paper wallets.
Walletgenerator.net: another open-source, client-side tool that supports multiple cryptocurrencies, including Bitcoin, Litecoin, and Dogecoin.
MyEtherWallet: a popular tool for creating Ethereum paper wallets. It also supports other Ethereum-based tokens.
Liteaddress.org: an open-source, client-side tool for creating Litecoin paper wallets.