Bip39 Wiki. Even though it employs BIP32 process you may still import BIP39 seeds into Electrum wallet. Also aside from BIp32 You can find BIP44 Variation which some wallet use to the era of seeds. The whole process of putting together a copyright wallet is similar to other software package https://bookmarkick.com/story18777066/bip39-mnemonic-phrase-tool-about-12-word-seed-phrase-generator-with-balance