Federated free open source communications platform with support for messaging and calling. The platform has many different apps available with the most popular being Element (formerly known as Riot).
Fediverse address:
@matrix@mastodon.matrix.org
Tagged: Instant Messaging
Dino
Free open source XMPP/Jabber app for Linux which includes support for end to end encrypted messaging, voice/video calls and conferencing.
Fediverse address:
@dino@fosstodon.org
Prav App
Free open source encrypted XMPP app for Android produced alongside a member-funded XMPP service, currently in private beta testing. Developed and run by a co-operative based in India.
Fediverse address:
@prav@venera.social
Prosody
Free open source software for running XMPP instant messaging servers, and one of the most popular ways to set up an XMPP server.
Fediverse address:
@prosodyim@fosstodon.org
XMPP Guppe Group
Discussion group about the XMPP / Jabber messaging standard. (Click here ⧉ for more info on how to use Fediverse groups.)
Fediverse address:
@xmpp@a.gup.pe
JoinJabber
Informal collective promoting the use of XMPP/Jabber messaging. They run a non-technical website, also called JoinJabber, which helps people sign up on XMPP and includes advice on apps and servers.
Fediverse address:
@joinjabber@indieweb.social
Snikket
XMPP-based free open federated messenger project. It aims to make XMPP into a more viable alternative to Whatsapp etc by providing consistency in design and terminology, while still maintaining compatibility with other XMPP apps and servers. (It’s a similar plan to how Mastodon made ActivityPub more mainstream while still being compatible with other ActivityPub server types.)
Fediverse address:
@snikket_im@fosstodon.org
Pidgin
Free open source instant messenger software compatible with XMPP / Jabber, IRC, Bonjour, Gadu-Gadu, Novell GroupWise, Lotus Sametime, SILC, SIMPLE and Zephyr. Available for Linux, BSD, Mac and Windows.
Fediverse address:
@pidgin@fosstodon.org
Tigase
Private company which develops free open software for instant messaging through XMPP. They have a number of XMPP projects including server software and apps for MacOS (Beagle), iOS (Siskin) and Android (Stork).
Fediverse address:
@tigase@fosstodon.org
Gajim
Free open source XMPP desktop app for Linux, Mac and Windows. Includes OMEMO end-to-end encryption support.
Fediverse address:
@gajim@fosstodon.org
Briar
Free open source end-to-end encrypted peer-to-peer messaging system for Android and Linux which can be used online through Tor, or locally through wifi or bluetooth. Especially suited to activists in repressive regimes or those working in disaster zones.
Fediverse address:
@briar@fosstodon.org
XMPP Providers
Website featuring a curated list of XMPP instances organised into categories based on the quality and type of services offered.
Fediverse address:
@xmpp_providers@fosstodon.org
Monal IM
Free open source XMPP messenger app for iPhone, iPad and Mac. It includes support for OMEMO end-to-end encryption.
Fediverse address:
@Monal@fosstodon.org
Kaidan
Free open source XMPP app for Linux and Android, and part of the KDE project. Includes OMEMO support for end-to-end encryption.
Fediverse address:
@kaidan@fosstodon.org
Jami
Free open source end-to-end encrypted peer-to-peer calling and messaging app. It supports video calls, audio, messaging and has a Skype-style interface. It has apps for all major platforms including Android, iPhone/iPad, Linux, Mac and Windows.
Fediverse address:
@Jami@mstdn.io
Delta Chat
Free open source end-to-end encrypted messaging system that works through email. This means if you both have Delta apps running you can chat in encrypted mode, but even people without Delta can chat with you through their normal email account. It’s available for Android, iOS, Linux, Mac and Windows.
Fediverse address:
@delta@chaos.social
NeoChat
Free open source Matrix messaging app for Linux desktop and Linux mobile. It’s made by KDE.
Fediverse address:
@neochat@kde.social
The XMPP Standards Foundation
Develops and maintains the XMPP standard for instant messaging and voice and video calls. It’s a free open federated standard, so anyone can set up their own server or write their own app. (XMPP used to be known as Jabber.)
Fediverse address:
@xmpp@fosstodon.org
Mellium Co-op
A co-operative organisation creating Go-based resources for the XMPP instant messaging protocol.
Fediverse address:
@mellium@social.coop