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ngIRCd is a free, portable and lightweight Internet Relay Chat server for small or private networks, developed under the GNU General Public License. It is simple to configure, can cope with dynamic IP addresses, and supports IPv6 as well as SSL. It is written from scratch and not based on the original IRCd.

DavMail POP/IMAP/SMTP/Caldav/Carddav/LDAP Exchange Gateway DavMail is a POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway allowing users to use any mail/calendar client (e.g. Thunderbird with Lightning or Apple iCal) with an Exchange server, even from the internet or behind a firewall through Outlook Web Access.

DSPAM (as in De-Spam) is an open-source project to create a new kind of anti-spam mechanism, and is currently effective as both a server-side agent for UNIX email servers and a developer's library for mail clients, other anti-spam tools, and similar projects requiring drop-in spam filtering.

fdm is a simple, lightweight replacement for mail fetch, filter and delivery programs such as fetchmail and procmail. It can currently fetch using POP3, POP3S, IMAP or from stdin, and deliver to a pipe, file, maildir, mbox or SMTP server, based on regexps.

Dovecot is a secure and compact IMAP server which is in the early stages of development. It supports Maildirs and mbox formats and much of the IMAP v4 protocol including SSL/TLS. IPv6 support is also included. Dovecot supports authentication with OpenLDAP, PostgreSQL, MySQL, vpopmail and PAM.

Twisted Mail contains high-level, efficient protocol implementations for both clients and servers of SMTP, POP3, and IMAP4. Additionally, it contains an "out of the box" combination SMTP/POP3 virtual-hosting mail server. Also included is a read/write Maildir implementation and a basic Mail Exchange calculator (depends on Twisted Names). Twisted Mail is available under the MIT Free Software licence.

Pyzor is a collaborative, networked system to detect and block spam using identifying digests of messages. Pyzor initially started out to be merely a Python implementation of Razor, but due to the protocol and the fact that Razor's server is not Free Software, I decided to Pyzor should be based upon a new, lighter, more language- independent protocol.

If you have an IMAP server with QUOTA Extension capability, you can use this plugin to view the current quota usage (both size and message count), which is displayed just above the folders list. A warning message can also be displayed to users upon login if desired. If no quota is set, nothing is displayed.

Twisted Words is the Chat and Instant Messaging portion of the Twisted system. It is both a multiprotocol instant messaging client and server and provides low-level protocol implementations of OSCAR (AIM and ICQ), IRC, MSN, TOC (AIM) as well as Jabber libraries. Twisted Words is available under the MIT Free Software licence.

Netmagis is a network management information system, which allows a network administrator to: - manage data for your BIND DNS and ISC DHCPD server, - delegate DNS management, - automatically generate network maps, - assign VLAN to equipment interfaces via a Web interface, - generate traffic graphs.