Bip39 generator python https://blogfreely.net/travenmdoq/create-your-own-distinct-bip39-mnemonic-expression-with-python-scripts Regardless that it uses BIP32 system you could still import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 version which some wallet use for your generation of seeds. Want to examine which wallets support the BIP39 mnemonic recovery see... https://bookmark-group.com/story5888045/bip39-offline-detailed-notes-on-bip39-wallet-https-cutt-ly-uryc5rw7