Bip39 split mnemonic https://list.ly/i/11078004 Even though it utilizes BIP32 process you can still import BIP39 seeds into Electrum wallet. Also apart from BIp32 There is certainly BIP44 Variation which some wallet use with the technology of seeds. BitBox02 - A successor towards the BitBox series, this hardware wallet supports BIP39 https://zbookmarkhub.com/story20316782/bip39-all-words-5-tips-about-bip39-standard-you-can-use-today-https-dzen-ru-bip39-phrase-com