Bip39 Utils. Though it uses BIP32 approach you may continue to import BIP39 seeds into Electrum wallet. Also other than BIp32 There may be BIP44 Variation which some wallet use for that era of seeds. Due to their sturdy style and design and simple-to-use interface, two Ledger wallets have designed https://wavesocialmedia.com/story4163090/electrum-seed-phrase-generator-bip39-mnemonic-code-converter-options