Privacy Guard (my copy)

The Sybil-detection engine, inverted to work for you: checks whether your wallets are linkable (shared funding sources, common counterparties, behavioral fingerprints) and tells you how to separate them. By the team that runs clustering for $512M+ of protected airdrops. No wallet or funding needed — it runs off-chain and starts free in beta (it still gets its own wallet behind the scenes, used only with your approval).