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Open Source Links and Resources

Open Source: Non-profit corporation dedicated to managing and promoting the Open Source Definition

Free Software Foundation: Established to promote computer users' rights to use, study, copy, modify, and redistribute computer programs.

The GNU Project: Established to develop a complete UNIX-like operating system which is free software: the GNU system.

Linux Distributions

Gentoo: A special flavor of Linux that can be automatically optimized and customized for just about any application or need.

Ubuntu: A complete Linux-based operating system, freely available with both community and professional support.

Redhat: One of the largest and most recognized companies dedicated to open source software and the largest distributor of the Linux operating system.

Fedora Core: An RPM-based Linux distribution, developed by the community-supported Fedora Project and sponsored by Red Hat.

Debian: A widely used distribution of free software developed through the collaboration of volunteers from around the world.

SUSE: Major retail Linux distribution, produced in Germany. The company is owned by Novell, Inc.

Slackware: One of the earliest Linux distributions, and is the oldest distribution still being maintained.

E-Mail Server Software

Postfix MTA: MTA mailer that started life as an alternative to the widely-used Sendmail program.

Courier-IMAP: Fast, scalable, enterprise IMAP amd POP3 server.

Maildrop MDA: Mail filtering and mail delivering agent.

E-Mail Filtering Software

Policyd-weight: policyd-weight is a Perl policy daemon for the Postfix MTA intended to eliminate forged envelope senders and HELOs (i.e. in bogus mails).

DSPAM: A powerful, statistical anti-spam toolkit which adapts and learns emailing habits.

SpamAssassin: A powerful, heirarchal anti-spam toolkit which uses a diverse range of tests to identify Spam.

ClamAV: An anti-virus toolkit for UNIX.

Pyzor: A collaborative anti-spam toolkit using digests of messages to identify spam.

DCC: A system of clients and servers that collect and count checksums of email messages in order to detect spam.

Greylisting: A new method of blocking significant amounts of spam at the mailserver level without heavyweight statistical analysis.

Postgrey: A Postfix policy server implementing greylisting.

SQLGrey: An SQL Postfix policy service implementing a grey-listing policy based on Postgrey.

SpamCop: A premier service for reporting spam.

Optical Character Recognition

Fuzzy OCR: A plugin for SpamAssassin for performing optical character recognition (using a variety of OCR engines) on attached or HTML embedded images.

Tesseract OCR: A commerical quality OCR engine open-sourced by HP and UNLV in 2005.

GNU Ocrad: An OCR engine based on a feature extraction method.

GOCR: An OCR engine.

Graphing Tools

RRDTool: A system to store and display time-series data.

MRTG: The Multi Router Traffic Grapher.

Mailgraph: A mail statistics RRDtool frontend for Postfix that produces daily, weekly, monthly and yearly graphs of received/sent and bounced/rejected mail.

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