Last updated
Developer(s) Grupa o2 Sp. z o.o.
Initial releaseOctober 2001 (2001-10)
Stable release / January 16, 2009;14 years ago (2009-01-16) (Windows)
Preview release / February 10, 2011;12 years ago (2011-02-10) (Windows, Linux, Mac OS X)
Operating system Microsoft Windows, Linux, Mac OS X
Available inPolish
Type Instant messaging client
License Freeware/Adware
Website was an adware licensed Polish instant messaging service. It was fully compatible with the main Polish Gadu-Gadu instant messenger. It was launched in 2001 and discontinued in May 2016. [1]


The communication protocol is based on open-source jabberd code, but it was modified significantly, making it incompatible with generic XMPP clients and servers. Among other features, allows for voice chats, SMS sending and video conferences. The versions later than 4.0 allow for creation and usage of plugins. Since then more than 130 plugins have been created by the community. By April 2008 there were more than 1 500 000 registered users and 780 000 real users of [2]

Tlen is also integrated with the mail system, which allows users to use mail in three domains:; and It is possible to easily access the mail system from the application. automatically checks the user's account and if there is any new mail, it displays a notification on their screen.

It is also possible to connect to from the homepage with a browser.

Since version, Tlen has included the Tlenofon plugin, which enables VoIP functionality for the client. Tlenofon is similar to the Skype service and offers low-priced calls to Poland and other countries.

In the second half of 2009, Tlen 7 Beta was published. There were no longer any advertisements. The popularity of the service has been declining, however. The software has not been updated since 2011, and the server has been shut down on 10 May 2016. [3]

See also

Related Research Articles

ICQ New is a cross-platform instant messaging (IM) and VoIP client. The name ICQ derives from the English phrase "I Seek You". Originally developed by the Israeli company Mirabilis in 1996, the client was bought by AOL in 1998, and then by Mail.Ru Group in 2010.

<span class="mw-page-title-main">Instant messaging</span> Form of communication over the Internet

Instant messaging (IM) technology is a type of online chat allowing real-time text transmission over the Internet or another computer network. Messages are typically transmitted between two or more parties, when each user inputs text and triggers a transmission to the recipient(s), who are all connected on a common network. It differs from email in that conversations over instant messaging happen in real-time. Most modern IM applications use push technology and also add other features such as emojis, file transfer, chatbots, voice over IP, or video chat capabilities.

<span class="mw-page-title-main">ChatZilla</span> IRC client

ChatZilla is an IRC client that is part of SeaMonkey. It was previously an extension for Mozilla-based browsers such as Firefox, introduced in 2000. It is cross-platform open source software which has been noted for its consistent appearance across platforms, CSS appearance customization and scripting.

<span class="mw-page-title-main">Pidgin (software)</span> Open-source multi-platform instant messaging client

Pidgin is a free and open-source multi-platform instant messaging client, based on a library named libpurple that has support for many instant messaging protocols, allowing the user to simultaneously log in to various services from a single application, with a single interface for both popular and obsolete protocols, thus avoiding the hassle of having to deal with a new software for each device and protocol.

<span class="mw-page-title-main">XMPP</span> Communications protocol for message-oriented middleware

Extensible Messaging and Presence Protocol is an open communication protocol designed for instant messaging (IM), presence information, and contact list maintenance. Based on XML, it enables the near-real-time exchange of structured data between two or more network entities. Designed to be extensible, the protocol offers a multitude of applications beyond traditional IM in the broader realm of message-oriented middleware, including signalling for VoIP, video, file transfer, gaming and other uses.

Eudora is an email client that was used on the classic Mac OS, Mac OS X, and Microsoft Windows operating systems. It also supported several palmtop computing platforms, including Newton and the Palm OS. In 2018, after being years out of print, the software was open-sourced by the Computer History Museum.

<span class="mw-page-title-main">Kopete</span> Free multiprotocol messenger

Kopete is a multi-protocol, free software instant messaging client released as part of the KDE Software Compilation. Although it can run in numerous environments, it was designed for and integrates with the KDE Plasma Workspaces. Kopete was started because ICQ blocked Licq from their network in 2001. According to the original author, Duncan Mac-Vicar Prett, the name comes from the Chilean Spanish word copete, meaning "a drink with your friends". Kopete has been nominated for multiple awards. The designated successor is KDE Telepathy from the KDE RTCC Initiative.

<span class="mw-page-title-main">Miranda NG</span> Free instant messenger for Microsoft Windows

Miranda NG is an open-source multiprotocol instant messaging application, designed for Microsoft Windows. Miranda NG is free software distributed under the GNU GPL-2.0-or-later.

<span class="mw-page-title-main">Adium</span>

Adium is a free and open source instant messaging client for macOS that supports multiple IM networks, including Google Talk and XMPP. In the past, it has also supported AIM, ICQ, Windows Live Messenger and Yahoo! Messenger. Adium is written using macOS's Cocoa API, and it is released under the GNU GPL-2.0-or-later and many other licenses for components that are distributed with Adium.

The TOC protocol, or Talk to OSCAR protocol, was a protocol used by some third-party AOL Instant Messenger clients and several clients that AOL produced itself. Sometime near August 19, 2005, AOL discontinued support for the protocol and no longer uses it in any of the instant messaging clients it actively maintains, such as its Windows and Mac clients for the AOL Instant Messenger and ICQ systems. However, it once did produce several of its own TOC clients, including TiK and TAC which are written in Tcl/Tk, TNT which is written in Emacs Lisp, all of which are open source, and a Java client originally called TIC which later became the Quick Buddy web applet. AOL also provided the TOC protocol specification openly to developers in the hopes that they will use it instead of the proprietary OSCAR protocol they use themselves. In July 2012, AOL turned off the TOC2 servers and it is no longer possible to connect to AIM using this protocol.

<span class="mw-page-title-main">Gadu-Gadu</span> Instant messaging software

Gadu-Gadu is a Polish instant messaging client using a proprietary protocol. Gadu-Gadu was the most popular IM service in Poland, with over 15 million registered accounts and approximately 6.5 million users online daily. Gadu-Gadu's casual gaming portal had some 500,000 active users at the end of March 2009. Users send up to 300 million messages per day.

<span class="mw-page-title-main">Psi (instant messaging client)</span>

Psi is a free instant messaging client for the XMPP protocol which uses the Qt toolkit. It runs on Linux, Windows, macOS and OS/2.

The following tables compare general and technical features of notable email client programs.

<span class="mw-page-title-main">Google Talk</span> Instant messaging service

Google Talk was an instant messaging service that provided both text and voice communication. The instant messaging service was variously referred to colloquially as Gchat, Gtalk, or Gmessage among its users.

<span class="mw-page-title-main">BitlBee</span>

BitlBee is a cross-platform IRC instant messaging gateway, licensed under the terms of the GNU General Public License.

<span class="mw-page-title-main">Xfire</span> Instant messaging service and game server browser

Xfire was a proprietary freeware instant messaging service for gamers that also served as a game server browser with various other features. It was available for Microsoft Windows.

Off-the-Record Messaging (OTR) is a cryptographic protocol that provides encryption for instant messaging conversations. OTR uses a combination of AES symmetric-key algorithm with 128 bits key length, the Diffie–Hellman key exchange with 1536 bits group size, and the SHA-1 hash function. In addition to authentication and encryption, OTR provides forward secrecy and malleable encryption.

<span class="mw-page-title-main">Kadu (software)</span>

Kadu is a free and open source multi-platform instant messaging client that supports Gadu-Gadu, XMPP IM networks and other services based on XMPP like Google Talk. It is written in C++ using Qt Framework, and released under the GNU GPL-2.0-or-later.

<span class="mw-page-title-main">Instantbird</span> Cross-platform instant messaging client

Instantbird is a discontinued cross-platform instant messaging client based on Mozilla's XULRunner and the open-source library libpurple used in Pidgin. Instantbird is free software available under the GNU General Public License. Over 250 add-ons allow user customization of, and addition of, features. On October 18, 2017, Florian Quèze announced that "... we are stopping development of Instantbird as a standalone product."

<span class="mw-page-title-main">Spark (XMPP client)</span>

Spark is an open-source instant messaging program that allows users to communicate in real time. It can be integrated with the Openfire server to provide additional features such as controlling the various Spark functionalities from a central management console, or integrating with a proprietary customer support service known as Fastpath which allows its users to interact with the platform using the Spark client. Being a cross-platform application, Spark can run on various systems. Installers for Windows, macOS and Linux are available on the official website.


  1. "Komunikator Tlen zakończył swój żywot" (in Polish).
  2. Archived June 3, 2008, at the Wayback Machine
  3. "Tlen - to już koniec popularnego komunikatora" (in Polish). 9 May 2016.