Bip39 adalah https://jsbin.com/titaniseko Although it uses BIP32 technique you'll be able to even now import BIP39 seeds into Electrum wallet. Also besides BIp32 there is BIP44 Variation which some wallet use with the generation of seeds. Simply because introducing a passphrase towards your seed words results in a different wallet, https://bookmarkingace.com/story20704435/bip39-mnemonic-generator-python-the-smart-trick-of-bip39-word-list-github-that-no-one-is-discussing-https-x-com-tundra838554