Communication software

WhatsApp Messenger, commonly known simply as WhatsApp, is an American social media, instant messaging (IM), and Voice over IP (VoIP) service accessible via desktop and mobile app. Owned by Meta Platforms, the service allows users to send text messages, voice messages, and video messages, make voice and video calls, and share images, documents, user locations, and other content. The service requires a cellular mobile telephone number to register. WhatsApp was launched in May 2009. In January 2018, WhatsApp released a standalone business app called WhatsApp Business which can communicate with th

Telegram is a cloud-based, cross-platform social media and instant messaging (IM) service. It launched for iOS on 14 August 2013 and Android on 20 October 2013. It allows users to exchange messages, share media and files, and hold private and group voice or video calls as well as public livestreams. It is available for Android, iOS, Windows, macOS, Linux, and web browsers. Telegram offers end-to-end encryption in voice and video calls, and optionally in private chats if both participants use a mobile device.

WeChat or Weixin in Chinese () is an instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 with over 1 billion monthly active users. The Chinese version of WeChat, Weixin, has been described as China's "app for everything" and a super-app because of its wide range of functions. WeChat provides text messaging, hold-to-talk voice messaging, broadcast (one-to-many) messaging, video conferencing, video games, mobile payment, sharing of photographs and videos and location sharing.

video-communication app

instant messaging and social networking service

messaging application developed by Google LLC

KakaoTalk (), commonly referred to as KaTalk () in South Korea, is an instant messenger and online services platform operated by Kakao Corporation. It was launched in 2010 and the app is available on mobile and desktop platforms.

decentralized encrypted chat and collaboration software powered by the Matrix protocol

distributed protocol for telephony and instant messaging

email, cloud storage, collaboration tools, hardware, administration, social media and other business apps

distributed open multimedia communications platform

processing of email to organize it according to specified criteria

free software framework for multiplatform hybrid mobile apps

Mattermost is an open-source, self-hostable online chat service with file sharing, search, and third-party application integrations. It is designed as an internal chat for organisations and companies, and mostly markets itself as an open-source alternative to Slack and Microsoft Teams.

Miitomo was a freemium social networking mobile app developed by Nintendo for iOS and Android devices. The app, Nintendo's first, allowed users to converse with friends by answering various questions, and featured Twitter and Facebook integration. The app was released in March 2016 for iOS and two months later for Android, launching alongside their My Nintendo service. Despite initially being a critical and commercial success, with over ten million downloads worldwide a month after release, its popularity dwindled soon after and it was ultimately discontinued on May 9, 2018.

instant messaging app by Turkcell

free peer-to-peer instant messenger

computer network protocol

Nimbuzz is a proprietary cross-platform instant messaging and social media and mobile payment developed by Kuraakani Online Private Limited, with the origins of its technology dating back to the early 2000s. As of March 2013, Nimbuzz had 150 million users in 200 countries. By April 2014, Nimbuzz was growing by more than 210,000 new registrations per day. In October 2014, now with over 200 million users, New Call acquired 70% of Nimbuzz, valuing the app at $250 million. Under Nimbuzz Board & Management teams leadership, Nimbuzz suite of applications enables users to enjoy end-to-end encrypted f

ChatON was a global mobile communication service provided by Samsung Electronics from September 2011 to March 2015.

Remmina is a free and open source remote desktop client for POSIX-based computer operating systems. It supports the Remote Desktop Protocol (RDP), VNC, NX, XDMCP, SPICE, X2Go and SSH protocols and uses FreeRDP as foundation.

Amikumu ( ; ) is a cross-platform app for smartphones (Android and iOS) which can be used to find people nearby who speak or learn the same languages as the user. The app was launched for Esperanto speakers on 22 April 2017 and for speakers of all languages during LangFest in Montreal on 25 August 2017. On 9 August 2018 Amikumu had members in more than 130 countries speaking 588 languages.

Hong Kongese delayed messaging application

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.

HyperACCESS (sometimes known as HyperTerminal) is a family of terminal emulation software by Hilgraeve. A version of HyperACCESS called HyperTerminal is included in some versions of Windows.

forfone is a free VoIP application that enables users to make calls, send and share text messages, photos, and their current location. The App does not require additional registration or a user account but allows direct access to mobile and landline networks worldwide via Wi-Fi, LTE, 3G or UMTS.

South Korean content platform

Arattai Messenger (or simply Arattai) is an encrypted messaging service for instant messaging, voice calls, and video calls, developed by Zoho Corporation. The name Arattai means "chat" or "conversation" in Tamil. The app was soft-launched in January 2021. The app saw a sharp surge in downloads in September 2025, partially fueled by endorsements from Indian government officials. However, the app dropped from the top rankings in October 2025.

encrypted instant messenger app (IM)

Elastix is a unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has a Web interface and includes capabilities such as a call center software with predictive dialing.

VoIP and instant messaging application for smartphones

Delrina Corporation was a Canadian software company active from 1988 to 1995. The company was best known for WinFax, a software package which enabled computers equipped with fax modems to transmit copies of documents to standalone fax machines or other similarly equipped computers. It also sold PerForm and FormFlow, electronic form software. Delrina was acquired by the American software firm Symantec in 1995.

video conferencing software

open-source UI software development kit for cross-platform applications

trixbox (formerly Asterisk@Home) was a software PBX based on Asterisk.