Google Talk

Google ChatGTalkchatGmail chatGoogle Talk with Videoinstant messagingTalk
Google Talk (also known as Google Chat ) (now Google Hangouts) was an instant messaging service that provided both text and voice communication.wikipedia
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Adium

AdiumX
However, users can still chat with other non-Google Talk users using third-party XMPP clients such as Adium. It is possible to have end-to-end encryption over the Google Talk network using OTR (off-the-record) encryption using other chat clients like Adium (for Mac) or Pidgin (for Linux and Windows).
Adium is a free and open source instant messaging client for macOS that supports multiple IM networks, including Windows Live Messenger, Yahoo! Messenger, Google Talk, AIM, ICQ and XMPP.

Psi (instant messaging client)

PsiPsi PortablePsi,
Other XMPP clients, such as Pidgin and Psi, were compatible with Google Talk's text chat (IM), allowing text chat with XMPP users on a variety of platforms.
Psi is a free instant messaging client for the XMPP protocol (including such services as Google Talk ) which uses the Qt toolkit.

Google Voice

Grand Central
In order to receive calls, however, the user must upgrade to a full Google Voice account.
Additionally, text messages can be sent and received via the familiar email or IM interface by reading and writing text messages in numbers in Google Talk respectively (PC-to-Phone texting).

Orkut

Google also integrated Google Talk with Orkut.
There was at one point an option to integrate GTalk with Orkut, enabling chat and file sharing.

Gizmo5

GizmoSIPphone
This included EarthLink, Gizmo5, Tiscali, NetEase, Chikka, MediaRing, and, according to Google, "thousands of other ISPs, universities, corporations and individual users."
On April 3, 2011 Google shut down Gizmo5 and recommended users to use Google Talk instead.

Voice over IP

VoIPvoice over Internet Protocolvoice-over-IP
On December 15, 2005, Google released libjingle, a C++ library to implement Jingle, "a set of extensions to the IETF's Extensible Messaging and Presence Protocol (XMPP) for use in voice over IP (VoIP), video, and other peer-to-peer multimedia sessions."
Third-generation providers, such as Google Talk, adopted the concept of federated VoIP—which is a departure from the architecture of the legacy networks.

Instant messaging

instant messengerIMinstant message
Google Talk (also known as Google Chat ) (now Google Hangouts) was an instant messaging service that provided both text and voice communication.
announced that by the 3rd quarter of 2006 they would interoperate using SIP/SIMPLE, which was followed, in December 2005, by the AOL and Google strategic partnership deal in which Google Talk users would be able to communicate with AIM and ICQ users provided they have an AIM account.

Federation (information technology)

federatedfederationfederated network
The connection between the Google Talk client and the Google Talk server is encrypted, except when using Gmail's chat over HTTP, a federated network that doesn't support encryption, or when using a proxy like IMLogic.
One could not send messages from GTalk accounts or XMPP (which Google/GTalk is federated with—XMPP lingo for federation is s2s, which Facebook and MSN Live's implementations do not support ) to AIM screen names, nor vice versa.

Google Hangouts

HangoutsGoogle+ HangoutGoogle Hangout
Google Talk (also known as Google Chat ) (now Google Hangouts) was an instant messaging service that provided both text and voice communication.
It replaces three messaging products that Google had implemented concurrently within its services, including Google Talk, Google+ Messenger (formerly: Huddle), and Hangouts, a video chat system present within Google+.

Pidgin (software)

PidginGaimlibpurple
Other XMPP clients, such as Pidgin and Psi, were compatible with Google Talk's text chat (IM), allowing text chat with XMPP users on a variety of platforms. It is possible to have end-to-end encryption over the Google Talk network using OTR (off-the-record) encryption using other chat clients like Adium (for Mac) or Pidgin (for Linux and Windows).
XMPP/Jingle (Google Talk, LJ Talk, Gizmo5, ...)

Jingle (protocol)

JinglelibjingleGoogle Talk voice calls
On December 15, 2005, Google released libjingle, a C++ library to implement Jingle, "a set of extensions to the IETF's Extensible Messaging and Presence Protocol (XMPP) for use in voice over IP (VoIP), video, and other peer-to-peer multimedia sessions."
The libjingle library, used by Google Talk to implement Jingle, has been released to the public under a BSD license.

Mylo (Sony)

MyloSony Mylomylo COM-2
Another Google Talk-compatible device is Sony's mylo, released on September 15, 2006.
Google Talk. Features text chats (instant messaging) with Google Talk and XMPP contacts. Included is a link to Gmail (WAP version).

XMPP

JabberExtensible Messaging and Presence ProtocolJabber/XMPP
Google dropped support for XMPP federation in May 2014, meaning that it no longer supports communicating with other XMPP servers. Google Talk used XMPP to provide real-time extensible messaging and presence events, including offline messaging and voice mailing.
In August 2005, Google introduced Google Talk, a combination VoIP and IM system that uses XMPP for instant messaging and as a base for a voice and file transfer signaling protocol called Jingle.

AIM (software)

AIMAOLAOL Instant Messenger
On December 6, 2007, Google upgraded its Gmail integrated chat to include AOL Instant Messenger chat capability.
Around 2011, AIM started to lose popularity rapidly, partly due to the quick rise of Gmail and its built-in real-name Google Chat instant messenger integration in 2011 and because many people started purely moving onto SMS text messaging and later social networking Web sites for instant messaging, in particular, Facebook Messenger, which was released as a standalone application the same year.

List of defunct instant messaging platforms

* List of defunct instant messaging platforms
Google Talk, 2017 – XMPP (Jabber)

Gmail

gmail.comGoogle Mailprivacy concerns
Google also provides a Voice and Video Chat browser plugin for Google Talk (not to be confused with the standalone Google Talk client) that supports voice and video chat between Gmail users.
In August 2010, Google released a plugin that provides integrated telephone service within Gmail's Google Chat interface.

Comparison of instant messaging clients

Comparison and overview of secure messengersComparison of XMPP clientsinstant messaging clients
Other XMPP clients, such as Pidgin and Psi, were compatible with Google Talk's text chat (IM), allowing text chat with XMPP users on a variety of platforms.

Presence information

presenceonline presencepresence events
Google Talk used XMPP to provide real-time extensible messaging and presence events, including offline messaging and voice mailing.
This IM protocol, which is a robust and widely extended protocol, is also the protocol used in the commercial implementation of Google Talk and Facebook Chat.

Off-the-Record Messaging

OTRoff the record messagingOff-the-Record
It is possible to have end-to-end encryption over the Google Talk network using OTR (off-the-record) encryption using other chat clients like Adium (for Mac) or Pidgin (for Linux and Windows).
Although Gmail's Google Talk uses the term "off the record", the feature has no connection to the Off-the-Record Messaging protocol described in this article, its chats are not encrypted in the way described above—and could be logged internally by Google even if not accessible by end-users.

Nimbuzz

For most smartphones, including Symbian-based as well as Android, third-party applications such as Nimbuzz and Fring include support for Google Talk accounts, including VoIP calls.
Nimbuzz supports interaction with popular messaging services such as Twitter, Facebook Chat and Google Talk.

Sean Egan

Sean Egan is a software engineer at Google, where he worked on Google Talk and is currently working on Google Maps.

Brastel Telecom

Increased bandwidth allowed free calling services such as Skype, Google Talk and iChat to emerge.

G Suite

Google AppsG-SuiteGoogle Apps for Education
Available for free as a beta service, it included Gmail, Google Talk, Google Calendar, and the Google Page Creator, which was later replaced with Google Sites.

Meetro

It was compatible with AOL Instant Messenger, Yahoo! Messenger, MSN Messenger, GTalk, XMPP, and ICQ.