Open Source Full Disk Encryption for BSD Operating System?

Anyone aware of an open source equivalent to full disk encryption products such as Pointsec (a Check Point product) where the machine won't boot unless a password is supplied?

Solution

From this Wikipedia page, I see the following disk encryption methods that are can be used on BSD (FreeBSD or NetBSD):

CGD (NetBSD)
GBDE (FreeBSD)
GELI (FreeBSD)

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