1)   Encryption Toolkit 2003 Trial Edition 1.0
The Encryption Toolkit includes all the tools you need to add file encryption and data encryption to your applications. The toolkit includes COM encryption objects with a standard interface for both the Pocket PC and Windows® desktop platforms.

 2)   HsCipherSDK Encryption Library 1.0
HsCipherSDK is an Encryption Library providing an API to a suite of symmetric cryptographic algorithms and digital signing functions. The library includes block and stream cipher modules: AES, 3DES, ARC4, CAST-128, Blowfish,Twofish, MD5, SHA-1.

 3)   .NET Encryption Library 1.09
Affordable, powerful, and easy to use .NET Encryption/Hashing/Compression Library. Encrypt sensitive information such as passwords, credit cards and social security numbers.

 4)   Xceed Encryption Library 1.1
The Xceed Encryption library allows you to easily add strong encryption and decryption capability to your Windows applications. Supports the latest industry-standard strong encryption algorithms and offers both symmetrical and public-key cryptography