John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. It supports several crypt(3) password hash types commonly found on Unix systems, as well as Windows LM hashes. On top of this, lots of other hashes and ciphers are added in the community-enhanced version (-jumbo), and some are added in John the Ripper Pro.
Perso can handle different types of identity card numbers (e.g. German/Austrian ID-card and passport). It can check the numbers for correctness using the "7-3-1"-checksum algorithm. Also it can extract information from the numbers (e.g. birthday) or generate example numbers using custom values.
snowdrop is a steganographic text document and C code watermarking tool that uses redundant, tamper-evident and modification-proof information embedded in the content itself, instead of the medium, to simplify tracking of proprietary code leaks, sensitive information disclosure, etc.
Webswell Connect is an e-business integration framework based on the ebXML standard. It allows easy, interactive and user-friendly installation. It consists of an ebXML registry/repository server and client, a messaging system for secure and reliable messaging and user interface similar to popular email clients for sending/handling ebXML messages. It supports HTTP, HTTPS, and email communication while keeping it safe and reliable by implementing digital signatures, encryption, acknowledgment mechanisms, duplication elimination, etc.
alph implements and analyzes historical and traditional ciphers and codes, such as polyalphabetic, substitutional, and mixed employing human-reconstructable algorithms. It provides a pipe filter interface in order to encrypt and decrypt block text to achieve transparency. The program is meant to be used in conjunction with external programs that transfer data, resulting in transparent encryption or decryption of information. The program can thus be used as a mail filter, IRC filter, IM filter, and so on.