Security

• YAFIG
  Yafig is a LAMP-based firewall rule generator. ...
  
• cp2fwbuilder
  cp2fwbuilder (Checkpoint Firewall 1 to FwBuilder) helps you to migrate an existing Checkpoint Firewall 1 installation and its rulesets to Linux with iptables or a BSD-based firewall. ...
  
• Falcon Firewall Project
  The Falcon Project (Free Application-Level CONnection kit) is an open firewall project with the intention of developing a free, secure and OS-independent firewall system. ...
  
• Wolverine Firewall
  Wolverine Firewall, for the easy configuration of IPTables. ...
  
• theWall
  TheWall is a collection of PicoBSD configuration trees and prebuild binaries for various platforms that provides NAT and firewall services for a small network. The goal of theWall project is to allow...
  
• ferm
  ferm is a tool to maintain and setup complicated firewall rules. It allows one to reduce the tedious task of carefully inserting rules and chains, thus enabling the firewall administrator to spend mo...
  
• The Doorman
  The doorman guards the door of a server, manipulating firewall rules to admit only recognized parties. Allows Silent Running - a server with all ports CLOSED. Linux-BSD-OSX server & client; C source ...
  
• Simple Firewall
  Simple Firewall is a easy tool for administration users and access control. This tool is made for Linux. Using iptables for packet filtering Write in perl Save rules with xml. That can be run in bash...
  
• redWall
  RedWall is a bootable CD-ROM Firewall. It's goal is to provide a feature rich firewall solution, with the main goal, to provide a webinterface for all the logfiles generated! ...
  
• SMCRoute
  SMCRoute is a command line tool to manipulate the multicast routes of the Linux kernel. It can be used as an alternative to dynamic multicast routers like 'mrouted' in situations where static multica...
  
• Linux dshield.org Perl Client
  The Linux dshield.org Perl Client package consists of an updated Linux dshield.org Perl client for submitting kernel firewall filter log entries to dshield.org. ...
  
• IP Tables State
  IP Tables State implements the "state top" feature from IP Filter for IP Tables. "State top" displays the states held by your stateful firewall in a "top"-like manner. Since IP Tables doesn't have a ...
  
• ASK - Active Spam Killer
  This program (Active Spam Killer, or ASK for short) takes an "Active" approach in solving the problem: Everytime an email is received, a message is sent back to the sender asking for confirmation. If...
  
• rblcheck
  rblcheck is a lightweight C program for doing checks against Paul Vixie's MAPS Blackhole List and the ORBS open relay list. It works well in conjunction with Procmail for filtering unwanted bulk emai...
  
• bogofilter
  Bogofilter is a mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body). The program is able to learn from the user's classifi...
  
• BlackMail
  BlackMail is an Anti-Spam mailer proxy for use with popular MTA's like Sendmail, QMail, and SMail. It is highly configurable, very powerful, very fast, and runs on a large variety of platforms. It ha...
  
• SpamAssassin
  SpamAssassin is a mail filter that uses a wide range of heuristic tests on mail headers and body text to identify spam. Once identified, the mail can then be optionally tagged as spam for later filte...
  
• qmail-smtpd-auth
  qmail-smtpd-auth is a patch for qmail that enables it to support SMTP AUTH protocol with the following auth types: LOGIN, PLAIN and CRAM-MD5. It's based on a previous patch by Mr.Brisby that implemen...
  
• junkfilter
  junkfilter is a procmail-based spam filtering system that is both configurable and customizable. ...
  
• GNU sauce
  Anti-spam server ...
  
• blq
  blq is a Perl script that queries one or more lists, such as the MAPS RBL or MAPS DUL, to determine if a host is listed as a potential source of spam or email abuse. ...
  
• MIMEDefang
  MIMEDefang is a program for inspecting and modifying e-mail messages as they pass through your mail relay. ...
  
• clamfilter
  Clamfilter is a small, secure, and very efficient content filter for Postfix designed for filtering messages efficiently through the clamd daemon. ...
  
• SpamBouncer
  The SpamBouncer is a set of procmail recipes, or instructions, which search the headers and text of your incoming email to see if it meets one or more of the predefined conditions. The SpamBouncer so...
  
• spamresponder
  Spamresponder is a very simple and radical spam filter. ...