Favorite Free Security Software

Disk Encryption:
FreeOTFE

DiskCryptor

TrueCrypt

 

File/Folder Encryption:

My LockBox - Free Software to Password Protect any Folder

Secret Disk - Password Protect your Hard Disk Free

Conceal: Freeware to Encrypt and Password Protect Files

 

Password Managers:  

KeePass Password Safe: the free, open source, light-weight and easy-to-use password manager.
http://keepass.info/index.html

Efficient Password Manager: a completely free but powerful and unique password management package.
http://www.efficientpasswordmanager.com/index.htm

PWGen is a password generator capable of creating large amounts of cryptographically-secure passwords or passphrases (from word lists).
http://pwgen-win.sourceforge.net/

KeePassMobile: Secure Password Management On The Go
http://www.keepassmobile.com/