GNU Mailutils

Web site:
Category: Network
Subcategory: Email Clients
Platform: UNIX-like
License: GPL
Interface: CLI
Programing language:
First release: 2010

GNU Mailutils – a rich and powerful protocol-independent mail framework. It contains a series of useful mail libraries, clients, and servers.

These are the primary mail utilities for the GNU system. The central library is capable of handling electronic mail in various mailbox formats and protocols, both local and remote. Specifically, this project contains a POP3 server, an IMAP4 server, and a Sieve mail filter. It also provides a POSIX “mailx” client and a collection of other handy tools.

Mailutils is oriented toward three kinds of audiences: regular users, system administrators, and developers of email-handling software.

Regular users will find here an implementation of the traditional UNIX mail reader mail, command line utilities, such as frm, messages, readmsg, and sieve — a flexible utility for filtering the incoming mail.

A special feature of Mailutils is an implementation of the MH Message Handling System, which combines a power of the UNIX philosophy with a flexibility of Mailutils libraries, thus allowing to easily incorporate mail from remote mailboxes.

For system administrators, Mailutils provides a set of daemons for delivering and reading electronic mail, including pop3d, imap4d, local mail transport daemon lmtpd, and a universal mail delivery agent, mda, and LMTP daemon.



Web site:
Category: Network
Subcategory: Web Browsers
Platform: Hurd, Linux, UNIX-like
License: GPL
Interface: cli
Programing language:
First release: 2000


Netrik – an advanced and simplistic text-mode WWW browser, similar to w3m or Lynx, focusing on a convenient user interface.

Netrik is Free Software published under the GNU General Public License (GPL), version 3.0 (or later), which essentially states that you can do anything with the program and its source code, as long as the result passes on the same freedoms.

Netrik runs on GNU-based systems such as GNU/Linux and GNU Hurd; and with a little extra effort, probably also on other modern UNIX-like systems.

Netrik has quite limited functionality compared to some other text mode browsers, confining its usefulnes as a generic web browser — however, it does come with some unique features too, which often make it more convenient to use in cases where it does work. (Mostly documentation in HTML format; and also some select sites on the internet, such as certain news sites for example.)



Web site:
Category: Network
Subcategory: Web browsers
Platform: Linux, OS X, Windows
License: MPL, GPL, LGPL
Interface: GUI
Programing language: C
First release: 2005 ?


IceCat (GNU IceCat) – a GNU version of the Firefox Extended Support Release (ESR) web browser. Its main advantage is an ethical one: it is entirely free software. While the Firefox source code from the Mozilla project is free software, they distribute and recommend non-free software as plug-ins and addons. Also their trademark license imposes requirements for the distribution of modified versions that make it inconvenient to exercise freedom 3.

GNU IceCat was formerly known as GNU IceWeasel but changed its name in 2008 to avoid confusion with Debian IceWeasel (who was rebranded back to Firefox in 2017 after Debian was being granted special permission from Mozilla).

Important differences between Mozilla’s Firefox and GNU IceCat is that IceCat is focused on freedom and privacy:
– Encrypted Media Extensions (EME) is not implemented
– Widevine Content Decryption Module provided by Google Inc. is not installed in about:addons > Plugins
– The Play DRM-controlled content option has been removed from about:preferences > Content
– WebRTC is enabled like in Firefox but prevent leaking the LAN IP
– The proprietary Mibbit is been removed
– Telemetry is disabled
– DuckDuckGo is the default search engine
– SpyBlock (Adblock Plus fork) to block privacy trackers is installed as default
– Https-Everywhere extension that encrypts your communications with many major websites, making your browsing more secure is installed
– Fingerprinting is a series of techniques allowing to uniquely identify a browser based on specific characters of that particular instance, is installed

The binary packages for Windows and macOS requires non-free software, so they are not distributed for those platforms (source code only).