Bip39 passphrase generator https://www.storeboard.com/myrtierisaliti Although it employs BIP32 approach it is possible to continue to import BIP39 seeds into Electrum wallet. Also besides BIp32 There may be BIP44 Edition which some wallet use to the generation of seeds. BIP39 is like the ability to “study” and comprehend the seed phrase. https://canvas.instructure.com/eportfolios/3396498/ricardooxtv236/bip39-generator-online-the-very-best-tools-for-secure-pocketbook-development