@scure/bip32

Secure, audited & minimal implementation of BIP32 hierarchical deterministic (HD) wallets over secp256k1

@metamask/scure-bip39

MetaMask fork of @scure/bip39: a secure, audited & minimal implementation of BIP39 mnemonic phrases

cryptils

Utilities around Master Password Algorithm (Spectre.app, by Maarten Billemont) and crypto, using Noble and Scure by Paul Miller. Stateless accounts & passwords, 2fa HOTP/TOTP, shamir secret sharing, crypto/bitcoin/nostr public and private keys, and more.