Email Security through Procmail (the Procmail Sanitizer) provides methods to sanitize email, removing obvious exploit attempts and disabling the channels through which exploits are delivered. Facilities for detecting and blocking Trojan Horse exploits and worms are also provided.
Distributed Checksum Clearinghouse (DCC) is a system of clients and servers that collect and count checksums related to mail messages. The counts can be used by SMTP servers and mail user agents to detect and reject bulk mail. DCC servers can exchange common checksums. The checksums include values that are "fuzzy", or constant across common variations in bulk messages.
Parallel File Scanner is a multithreaded parallel file scanner that combines the functionality of find, xargs, and fgrep. It has the potential of being faster than find+xargs+fgrep on systems with multiple CPUs, multiple disks, and a good file system that supports parallel operations.
Mail2sh makes it possible to carry out shell commands by email. Email is sent to a particular user on your host and the commands will be carried out if the user and password given matches ones in /etc/passwd. Commands are executed with the user's privileges, and combined with a PGP module ensures a certain level of security for use. Note that the system is not natively encrypted, so use of an encryption mechanism is highly recommended for security reasons.
tgen generates a Web site from a collection of input files of a variety of types, using a set of registered HTML autogenerators. This allows, for example, the generation a Web site consisting of plain text pages, EtText formatted files, man or POD documentation, and/or custom formats, with a consistent and attractive look-and-feel. It is a driver program; the actual conversion work is done by a set of plugin filters or "autoformatters" (named *2hts[.*]).