Bip39 Java. Despite the fact that it takes advantage of BIP32 method you'll be able to even now import BIP39 seeds into Electrum wallet. Also aside from BIp32 There exists BIP44 version which some wallet use for the generation of seeds. The BIP39 standard was designed to make it simpler https://natural-bookmark.com/story18568762/bip39-browser-rumored-buzz-on-bip39-phrase-generator