Bip39 test vectors https://www.symbaloo.com/mix/bookmarks-xfkm Even though it takes advantage of BIP32 approach you could still import BIP39 seeds into Electrum wallet. Also other than BIp32 There's BIP44 Variation which some wallet use for that generation of seeds. BitBox02 - A successor to your BitBox sequence, this components wallet supports BIP39 https://yoursocialpeople.com/story5948311/bip39-regex-indicators-on-bip39-standard-you-should-know-https-x-com-tundra838554