AES Pro
AES Pro is the utility program that creates active public keys. Active key is an executable program that contains a public key and the software necessary to encrypt messages and decrypt the answer-back messages. Users can create active public keys that anyone can use to encrypt messages. ... These active public keys are ideal to create communication with the users who do not have the PGP or CHAOS Public Key programs installed. ... No other software is required.
http://www.abensoft.com/DEMO/aesp.exe - 1,007Kb - Download - Screenshot

CHAOS Public Key
CHAOS+PK uses the newest chaos. It is high speed and allows variable-length keys, making protection very reliable and suitable for use in working. Uses the Public Key for encryption CHAOS keys by send off data on email. The program is compact, efficient and user friendly. ... CHAOS & Public Key make dialogue free. ... CHAOS made the security simple. ... Integrated file shredder included. ... CHAOS supports Windows drag-and-drop and can compress data before encryption.
http://www.safechaos.net/DEMO/cpk.exe - 397Kb - Download - Screenshot

Active CHAOS
Active CHAOS is the utility program that creates active public keys. Active key is an executable program that contains a public key and the software necessary to encrypt messages and decrypt the answer-back messages. Users can create active public keys that anyone can use to encrypt messages. ... These active public keys are ideal to create communication with the users who do not have the PGP or CHAOS programs installed. ... No other software is required.
http://safesofthome.com/counter/download.asp?file=ac.exe - 996Kb - Download - Screenshot

ECBackup
ECBackup is a archiver with strong-security, based on open key technology. It's very like to PGP, but uses more reliable and efficient methods of compression and encoding. You have oppotunity to work with ECBackup from the command line but not only. ... The applied technology of open keys allows safely to store a public key on the disk and guarantees impossibility of restoring of your private key from public. ... The special program ECExchange, included in the package ECBackup, allows easily and reliably to interchange files and correspondence in open and unguarded networks (LAN, Internet).
http://www.softcomplete.com/download/ECBackupSetup.exe - 1Mb - Download - Screenshot

Infralution Licensing System
Infralution Licensing System (ILS) is an affordable, 100% . NET solution for licensing components and applications using simple and secure encrypted license keys. ILS uses a public key encryption algorithm to generate encrypted license keys which are virtually impossible for a cracker to reverse... Each license key contains a unique client identifier and may also contain additional product information to allow issuing of license which unlock certain features in your application. ... The runtime licenses are keyed to the design time license that generated them - but they can not be...
http://www.infralution.com/downloads/InfralutionLicensing.msi - 2Mb - Download - Screenshot

Deltacrypt oneclick encryption Personnal Use
DeltaCrypt OneClick Personal does it all: This Public Key Encryption Software encrypts files, text and emails with 1024-bit RSA protection, digital signatures, andunalterable public keys. It offers the basic encryption functionalities FREE OF CHARGE. ... Forpersonal use only. ... Select files and folders or a combination of both and let DeltaCrypt OneClick Personal secure your sensitive data.
http://www.deltacrypt/next/_demo_/OP/setup.exe - 1Kb - Download - Screenshot

BCArchive
With BCArchive software you may encrypt and compress a group of files/folders to an encrypted archive (i. e. single file). You may store all you confidential files in such archive accessing it whenever you need it. All your files are encrypted, i. e. ... BCArchive uses strong symmetric encryption algorithms such as Blowfish, IDEA, Triple-DES, CAST5; secure hash algorithms: SHA-1, MD5, RIPEMD-160; asymmetric (public/secret key) algorithms such as RSA, ELGamal/Diffie-Hellman; conforms to specifications PKCS #5, PKCS #12, X.
http://www.jetico.com/bcarchive.exe - 3Mb - Download - Screenshot

HardKey License Manager
HardKey System is easy and powerfull license manager and work with short (15-25 chars) keys. Program based on strong asymetric (public keys) cryptography. HardKey Base Features : - Short registration key (by example: "29UD4-3K6GH-VE5SX-ZA7EK") - Key may contain following optional fields:... - Automatic source code generation for end-application key verify unit (plugins, Delphi, C/C++) - Black list automathic support in key verification module. ... - Key always includes license type info (up to 8 types).
http://www.softcomplete.com/download/hardkey.zip - 8Mb - Download - Screenshot

Public Key File and Email Encryption freeware
DeltaCrypt OneClick Personal does it all: This Public Key Encryption Software encrypts files, text and emails with 1024-bit RSA protection, digital signatures, and unalterable public keys. It offers the basic encryption functionalities FREE OF CHARGE. ... One of the features of DeltaCrypt OneClick Personal is its ease of use with any email or text messaging software. ... From the icon in the System Tray, you can quickly encrypt or decrypt your email text …and then get back to what you were doing.
http://www.deltacrypt.com/next/_demo_/setup.exe - 1Mb - Download - Screenshot

DeepCoder
With DeepCoder you can protect your privacy when you are sending confidential e-mails and/or files over the internet and when you are storing private files on your computer. DeepCoder is a program to encrypt, decrypt and/or digitally sign e-mails and files using secret keys (passwords) or public... - DeepCoder uses secret key encryption (AES/Rijndael) and public key encryption (RSA). ... With DeepCoder you can encrypt your files so that nobody but you (or someone else who has the key) can read your files.
http://www.devotechs.com/downloads/setup.exe - 803Kb - Download - Screenshot