CryptoStorage for Pocket PC 1.5.1
CryptoStorage is a reliable and easy-to-use system for encrypting private data and controlling access to it. With CryptoStorage, you can create one or more cryptographic storages and store files in them. An open storage is a special folder in the root directory of your Pocket PC. You specify the name of this folder when you create the storage. All data read from or written to this folder gets transparently encrypted/decrypted on the fly.

MemLocker 1.03
MemLocker is a safe, fast and easy to use solution for Pocket PC for protecting information on external storage cards (SD, MMC, etc.). It locks inserted cards when you're switching off your Pocket PC and automatically unlock them when you switch it on and enter the password for your device. MemLocker completely locks card. MemLocker does its work in times faster than other utilities. MemLocker has very easy and friendly user interface.

SecuBox for Pocket PC 1.3.1
Encryption software for Windows Mobile PDAs and PDA Phones. Keeps confidential data secure and protects it with strong AES 256-bit encryption. Ideal for encrypting Pocket PC space and its memory cards. Ensures the security of the protected data even if the device is lost or stolen.

Crippin 2.13
Crippin was designed to protect confidential files (text documents, spreadsheets, graphics, photographs, multimedia, etc.) in case a Pocket PC is lost or stolen. It’s been designed to be quick-and-easy to use, small (minimal executable size), miserly (with respect to storage required both during and after encryption), and secure (using 128-bit RSA encryption, where available, and wiping both passwords and unencrypted data after use).