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If you use procmail, there will be an example at: ${PREFIX}/share/autoconvert/procmailrc.example, which helps you to setup autoconvert as a filter of procmail.

This is a text filter for turning "cvs diff" output into something that patch(1) understands. This is needed when your version of cvs(1) makes diffs that confuse patch(1).

A filter program, used to generate text to be included into C code as #define, provides the conversion of newlines and quotes into standard C-code text

RubyFilter is a set of Ruby classes built on top of the RubyMail library that make it easy to write programs that filter and deliver email to mailboxes.

Pftop is a small, curses-based utility for real-time display of active states and rule statistics for pf, the packet filter (for OpenBSD)

Pfstat is a small utility that collects packet filter (security/pf) statistics and produces graphs like mrtg or alike. Samples can be found at the website below.

The skem utility is a sendmail milter, that checks and maintains a list of whitelisted, temporary banned, and permanently blacklisted IP-addresses. How you obtain the entries is up to you, but the included logwatcher module provides one possibility. The list is stored in a directory, each entry being a file (usually -- zero sized) or a symlink (usually -- a "broken" one). Such entries are stored efficiently (within the directory itself) and the directories are searched using the hash tables on modern file systems. At the same time, they can be listed, added, and removed with the simple ls(1), touch(1), and rm(1). This milter does not itself filter spam, instead it memorizes the verdicts issued by your other anti-spam defenses to reduce the system load and resource consumption, by temporarily rejecting the relays suspected of spamming (banned) and, optionally, by permanently rejecting the relays "convicted" of spamming (blacklisted). The idea is to stem the spam from real spam sources, while reducing the ill effects of false-positives to merely delaying, rather than rejecting future messages.

WhySynth is a versatile softsynth which operates as a plugin for the Disposable Soft Synth Interface (DSSI). A brief list of features: - 4 oscillators, 2 filters, 3 LFOs, and 5 envelope generators per voice. - 11 oscillator modes: minBLEP, wavecycle, chorused wavecycle, asynchronous granular, three FM modes, waveshaper, noise, PADsynth, and phase distortion. - 10 filter modes. - flexible modulation and mixdown options, plus effects.

Text::Decorator is a framework for marking up plain text into various formats by applying a chain of filters. For instance, you might apply a filter which will cause URIs in text to be presented as links if the text is exported as HTML.

scam-backscatter milter Scam-backscatter prevents spam backscatter (accept and bounce) on mail servers which don't host mailboxes locally. It validates mailboxes by verifying the recipient addresses hosted on a different mail server.