Bip39 onekey http://www.mediafire.com/file/uilrjfajg2ami24/pdf-14673-57158.pdf Though it takes advantage of BIP32 technique you could continue to import BIP39 seeds into Electrum wallet. Also besides BIp32 There's BIP44 version which some wallet use for the generation of seeds. Because adding a passphrase towards your seed words generates a new wallet, almost every other https://www.4shared.com/s/fAf7kF4dLku