FreeOTFE is a Free On The Fly Encryption tool that can be used for Portable USB Encryption. The tool can be used to create encrypted volumes, virtual disks or entire partitions using AES, Blowfish, Serpent, Twofish encryption algorithms.
Remora USB Disk Guard is FREE USB Flash Drive Encryption Software that can be used to Encrypt files and folders either on your USB drive or even on a local hard disk. Because Remora USB Disk Guard is completely portable, it can be stored and run directly from a flash drive or portable storage device, requiring absolutely no installation.
nPassword is another portable password storage tool that can be used to encrypt and securely store your passwords. It claims to be even more secure than it's competitors.
Omziff is a FREE Portable Encryption utility that utilizes common cryptographic algorithms to both encrypt and decrypt textual file types. Omziff can generate random passwords, splits files, and perform secure (DOD) file deletion as well.
Koma Mail is a free portable e-mail client. It supports multiple user accounts, IMAP, POP3, SMAP, WebDAV, encryption via SSL, spam filter, built in
