Windows instant messaging clients

Skype () was a proprietary telecommunications application operated by Skype Technologies, a division of Microsoft, best known for IP-based videotelephony, videoconferencing and voice calls. It also had instant messaging, file transfer, debit-based calls to landline and mobile telephones (over traditional telephone networks), and other features. It was available on various desktop, mobile, and video game console platforms.

Discord is an instant messaging and VoIP social platform that allows communication through voice calls, video calls, text messaging, and media. Communication can be private or in virtual communities called "servers". A server is a collection of persistent chat rooms and voice channels accessed by invitation links. Discord runs on Windows, macOS, Android, iOS, iPadOS, Linux, and in web browsers.

deprecated instant messaging client

former instant messaging service

graphical multi-protocol instant messaging client

instant messaging software service

instant messenging protocol

instant messaging service

instant messaging application

Jitsi (from , "wires") is a collection of free and open-source multiplatform voice (VoIP), video conferencing and instant messaging applications for the Web platform, Windows, Linux, macOS, iOS, iPadOS, watchOS, and Android. The Jitsi project began with the Jitsi Desktop (previously known as SIP Communicator). With the growth of WebRTC, the project team focus shifted to the Jitsi Videobridge for allowing web-based multi-party video calling. Later the team added Jitsi Meet, a full video conferencing application that includes web, Android, iOS, iPadOS, and watchOS clients. Jitsi also operates me

aMSN was a free Windows Live Messenger clone. aMSN attempted to emulate the look and feel of Windows Live Messenger, and supported many of its features. It had been downloaded approximately 40 million times as of January 2011, making it the 21st most downloaded project on SourceForge.

Gadu-Gadu (Polish for "chit-chat"; commonly known as GG or gg) is a Polish instant messaging client using a proprietary protocol. At its peak, Gadu-Gadu was the most popular IM service in Poland, with over 15 million registered accounts and up to 300 million messages sent per day. In 2010, the service reported over 10 million monthly active users.

instant messaging client

instant messaging client

distributed protocol for telephony and instant messaging

Gajim is an instant messaging client for the XMPP protocol which uses the GTK toolkit. The name Gajim is a recursive acronym for "Gajim's a jabber instant messenger". Gajim runs on Linux, BSD, macOS, and Microsoft Windows. Released under the GPL-3.0-only license, Gajim is free software. A 2009 round-up of similar software on Tom's Hardware found version 0.12.1 "the lightest and fastest jabber IM client".

QuteCom (previously called WengoPhone) was a free-software SIP-compliant VoIP client developed by the QuteCom (previously OpenWengo) community under the GPL-2.0-or-later license. It allows users to speak to other users of SIP-compliant VoIP software at no cost. It also allows users to call landlines and cell phones, send SMS and make video calls. None of these functions are tied to a particular provider, allowing users to choose among any SIP provider.

imo.im is a proprietary audio/video calling and instant messaging software service. It allows sending music, video, PDFs and other files, along with various free stickers. It supports encrypted group video and voice calls with up to 20 participants. According to its developer, the service possesses over 200 million users and over 50 million messages per day are sent through it.

Guilded was a VoIP, instant messaging, and digital distribution platform designed by Guilded Inc. and was bought by Roblox Corporation on August 16, 2021 for $90 million. Since then, Guilded had been integrated with Roblox. The company was based in San Francisco. Users communicated with voice calls, video calls, text messaging, media and files in private chats or as part of communities called "servers". Guilded was founded by Eli Brown, a former Facebook and Xbox employee. Guilded was available on Windows, Linux, macOS, Android, and iOS. == Features == Guilded was a main competitor of Discord

Gizmo5 (formerly known as Gizmo Project and SIPphone) was a voice over IP communications network and a proprietary freeware soft phone for that network. On November 12, 2009, Google announced that it had acquired Gizmo5. On March 4, 2011, Google announced that the service would be discontinued as of April 3, 2011.

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."

IMVU (, stylized as imvu) is an online virtual world and social networking site.

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

ooVoo was a video chat and messaging app developed by ooVoo LLC and owned by Krush Technologies, LLC. ooVoo had applications for Android, iOS, Mac OS X, Microsoft Windows, Windows Phone, and Facebook. The original Microsoft Windows app was released in 2007. It was discontinued on November 25, 2017.

Linphone (contraction of Linux phone) is a free voice over IP softphone, SIP client and service. It may be used for audio and video direct calls and calls through any VoIP softswitch or IP-PBX. Linphone also provides the possibility to exchange instant messages. It has a simple multilanguage interface based on Qt for GUI and can also be run as a console-mode application on Linux.

Meetro was a multi-network social messenger with location-based services (LBS). It was compatible with AOL Instant Messenger, Yahoo! Messenger, MSN Messenger, GTalk, XMPP, and ICQ. Meetro's features made it useful for meeting people with similar interests in a given area, as well as bundling multiple messaging protocols into one program. Meetro was located in San Francisco, California.

WASTE is a peer-to-peer and friend-to-friend protocol and software application developed by Justin Frankel at Nullsoft in 2003 that features instant messaging, chat rooms, and file browsing/sharing capabilities. The name WASTE is a reference to Thomas Pynchon's novel The Crying of Lot 49. In the novel, W.A.S.T.E. is (among other things) an underground postal service.

Wengo was at the beginning of 2004 a subsidiary of French telecom service provider Neuf Cegetel. As of February 2012, Wengo employs 80 people in the Paris headquarters, and is a subsidiary of Vivendi. Wengo is now repositioned as an online personal and consulting services marketplace.

Tkabber is a GPL instant messaging client for the XMPP protocol which uses the Tk toolkit for the GUI. It runs on anything to which Tcl/Tk is ported: almost any X-based system (namely, any Linux and *BSD, Solaris, etc.), Microsoft Windows, and Mac OS X.

__NOTOC__ climm (previously mICQ) is a free CLI-based instant messaging client that runs on a wide variety of platforms, including AmigaOS, BeOS, Windows (using either Cygwin or MinGW), OS X, NetBSD/OpenBSD/FreeBSD, Linux, Solaris, HP-UX, and AIX.

net2phone is a Cloud Communications provider offering cloud based telephony services to businesses worldwide. The company is a subsidiary of IDT Corporation.

defunct social networking service