Bip39 mnemonic generator python https://www.empowher.com/user/4550298 Even though it takes advantage of BIP32 approach you are able to nevertheless import BIP39 seeds into Electrum wallet. Also apart from BIp32 There may be BIP44 Edition which some wallet use for that technology of seeds. The amount of protection does a passphrase add? https://iwanttobookmark.com/story20636271/bip39-one-not-known-factual-statements-about-bip39-word-list-txt-https-dzen-ru-bip39-phrase-com