Bip39 generator offline https://canvas.instructure.com/eportfolios/3396498/ricardooxtv236/bip39-generator-online-the-very-best-tools-for-secure-pocketbook-development Though it employs BIP32 system you could even now import BIP39 seeds into Electrum wallet. Also besides BIp32 There may be BIP44 Edition which some wallet use for your generation of seeds. The BIP39 word list is usually ... https://livebackpage.com/story5520211/electrum-import-bip39-everything-about-bip39-word-list-txt-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw