Keystone bip39 https://andersonehmh757.timeforchangecounselling.com/getting-your-first-bip39-passphrase-idea Although it uses BIP32 method you may even now import BIP39 seeds into Electrum wallet. Also other than BIp32 there is BIP44 version which some wallet use to the generation of seeds. It is very simple — if you don't worry about copyright inheritance, no one else https://sergiouwfc622.fotosdefrases.com/exactly-how-to-generate-a-bip39-seed-a-step-by-step-guide