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Unzip will list, test, or extract files from a ZIP archive, commonly found on MS-DOS systems. The default behavior (with no options) is to extract into the current directory (and subdirectories below it) all files from the specified ZIP archive. Unzip is compatible with archives created by PKWARE's PKZIP, but in many cases the program options or default behaviors differ. Zipinfo lists technical information about files in a ZIP archive, most commonly found on MS-DOS systems. Such information includes file access permissions, encryption status, type of compression, version and operating system or file system of compressing program, and the like. Funzip acts as a filter; that is, it assumes that a ZIP archive is being piped into standard input, and it extracts the first member from the archive to stdout. If there is an argument, then the input comes from the specified file instead of from stdin. Unzipsfx may be used to create self-extracting ZIP archives from previously created ZIP archives.

mod_tidy validates the HTML output of your apache2 webserver. So you don't need a separate application to check your HTML. It works as a filter that hooks up to HTML output. mod_tidy feeds the HTML output to TidyLib which validates the HTML output. If TidyLib finds an error the client receives a HTML page with a list of all found errors. If TidyLib doesn't complain you will get your HTML data as without mod_tidy.

The program mph tries to generate an order preserving minimal perfect hashing (MPH) function for the set of keys, one per line, on stdin. Each key can be at most 4095 characters long (see keys.h to increase this limit), and the keys must be unique. If mph terminates, it emits a language independent binary or text representation of the MPH function on stdout. To generate a usable hash function, this output should be fed to a language dependent filter, like emitc.

Mail::Audit was inspired by Tom Christiansen's audit_mail and deliverlib programs. It allows a piece of email to be logged, examined, accepted into a mailbox, filtered, resent elsewhere, rejected, replied to, and so on. It's designed to allow you to easily create filter programs to stick in a .forward file or similar. Mail::Audit groks MIME; when appropriate, it subclasses MIME::Entity. Read the MIME::Tools man page for details.

lv is a powerful multilingual file viewer. lv can decode and encode multilingual streams through many coding systems, for example, ISO 2022 based coding systems such as iso-2022-jp, and Unicode streams encoded in UTF-7 or UTF-8. lv can be used not only as a file viewer but also as a coding-system translation filter. lv can recognize multi-bytes patterns as regular expressions, and lv also provides multilingual grep (1) functionality by giving it another name, lgrep.

OpenVanilla (OV) is an input method (IM)/output filter (OF) framework designed for better end-user text processing experiences. For example, OpenVanilla provides a comprehensive set of Traditional Chinese input methods that are lacking or of which counterparts are functionally deficient/unsatisfactory in Apple's Mac OS X. Many Simplified Chinese users also find this framework useful. A Tibetan IM module is also available. OpenVanilla framework is a set of header files for OpenVanilla module development.

CGI::SSI is meant to be used as an easy way to filter shtml through CGI scripts in a loose imitation of Apache's mod_include. If you're using Apache, you may want to use either mod_include or the Apache::SSI module instead of CGI::SSI. Limitations in a CGI script's knowledge of how the server behaves make some SSI directives impossible to imitate from a CGI script.

ifile is a general mail filtering system that works with a mail client to intelligently filter mail according to the way the user tends to organize mail. ifile uses the machine learning algorithm Naive Bayes to classify e-mail documents. ifile is different from other mail filtering programs in three major ways: 1.ifile does not require you to generate a set of rules in order to successfully filter mail 2.ifile uses the entire content of messages for filtering purposes 3.ifile learns as you move incorrectly filtered messages to new mailboxes ifile is not dependent upon any specific mail system and should be adaptable to any mail system which allows an outside program to perform mail filtering.

renattach is a fast and efficient e-mail stream filter written by Jem Berkes. It can rename or delete potentially dangerous attachments or even eliminate entire messages to help sites deal with resource strains caused by virus floods. Unlike conventional virus scanners, there are no specific virus or worm definitions. Instead, attachments are classified based on file extension and executable encoded body content. Features - Fast, efficient, lightweight, little overhead, pure C code - Recognizes both MIME and uuencoded attachments - Compliant with RFC2047 and RFC2231, handles encoded filenames - Capable of reading filenames inside ZIP archives, on the fly - Can rename or delete attachments, or kill entire messages - Can detect executables that carry DOS/Windows signature - Supports list of banned filenames (great for handling floods) - Simple pipe/stream operation; can be used within many filtering systems - Can be used directly as a content_filter for Postfix MTA - Can be installed as a local delivery agent for Sendmail MTA

EtherApe is a graphical network monitor for Unix modeled after Etherman. Featuring link layer, IP and TCP modes, it displays network activity graphically. Hosts and links change in size with traffic. Color coded protocols display. It supports Ethernet, FDDI, Token Ring, ISDN, PPP, SLIP, and WLAN devices, plus several encapsulation formats. It can filter traffic to be shown, and can read packets from a file as well as live from the network. Node statistics can be exported.