SecExMail makes e-mail encryption as easy as sending a message. There are no plugins necessary and it works with any standard email client including Outlook, Outlook Express, Calypso, Eudora and many more. Includes html email filters. Free.
A programmable multiple-precision hex calculator with many utilities. With it, you can perform a lot of big number math and encryption operations, such as: square root, modular inverse; hash make; primality test; hex, dec, oct, bin conversions.
Windows software for encryption and decryption of single files or multiple files in a single operation for secure storage or secure transmission. It uses a 500-bit key for security, and has features designed to minimize the chances of user error.