Free open-source disk encryption software. Create encrypted containers (virtual drives) or encrypt entire partitions and drives. Uses AES, Twofish, Serpent or combinations. The reason this exists in a crypto security section: if someone steals your laptop or seizes your computer, they get nothing. Your seed phrases, private keys, password databases, everything stays encrypted. Deniable encryption feature lets you have a hidden volume inside a visible one. Not the most user-friendly tool, but the peace of mind is worth it.