Gajim is a free open source instant messaging app for the XMPP / Jabber network. You can follow at:

➡️ @gajim

It's available for Linux, Mac and Windows at gajim.org

The free open source email app Thunderbird is now on here, you can follow them at:

➡️ @thunderbird

Thunderbird is the most popular free open desktop email software in the world, and is available for Linux, Mac and Windows.

You can find out more at thunderbird.net

As well as email, it also works as an RSS news reader and XMPP and IRC chat client.

Prosody is free open source software for running XMPP/Jabber messaging servers. You can follow their official account at:

➡️ @prosodyim

Their website is at prosody.im

Prosody is an extremely popular way of running XMPP servers.

If you're looking for a complete XMPP system, check out the same developers' @snikket_im platform which includes server and client software.

Dino is a free open source XMPP/Jabber app which includes support for encrypted messaging, voice/video calls and conferencing. You can follow at:

➡️ @dino

It's available for many different versions of Linux from dino.im

Snikket is a project to make XMPP/Jabber decentralised instant messaging much easier to use. You can follow at:

➡️ @snikket_im

The website is at snikket.org

Snikket is releasing Android and iOS apps, and server hosting software, all with a consistent look, feel and branding.

The aim is to make XMPP easy enough for ordinary users, the same way Mastodon did with ActivityPub.

Dino is a free open source XMPP/Jabber messaging app for Linux and BSD desktop computers. You can follow at:

➡️ @dino

The official site is at dino.im

Dino supports end-to-end encrypted messaging through OMEMO, and they are now testing encrypted video calls too.

Tigase is a private company which develops free open software for instant messaging through XMPP/Jabber. You can follow them at:

➡️ @tigase

They have a number of XMPP projects including server software and apps for MacOS (Beagle), iOS (Siskin) and Android (Stork).

Their website is at tigase.net

Monal IM is a FOSS XMPP/Jabber messenger app for iPhone, iPad and Mac, you can follow it here:

➡️ @Monal

You can find out more from the official site at monal.im

Monal is available from the Apple App Store and it supports OMEMO end-to-end encryption.

Kaidan is an XMPP/Jabber app for Linux and Android, and part of the @kde project. You can follow at:

➡️ @kaidan

You can download or find out more from the website at kaidan.im

The XMPP Standards Foundation develops the XMPP/Jabber instant messaging and voice/video calling standards. You can follow them at:

➡️ @xmpp

The official site is xmpp.org

It's a free open standard, so anyone can use it in their software and hardware.

Snikket is a new XMPP/Jabber-based decentralised FOSS messenger service. You can follow at:

➡️ @snikket_im

The official website is snikket.org

It aims to make XMPP into a more viable alternative to Whatsapp etc by providing consistency in design and terminology.

(It's sort of how Mastodon made ActivityPub more mainstream, by using consistency to make it clear the instances are part of one network.)

Gajim is a free open source XMPP / Jabber app for Linux, Mac and Windows. You can follow at:

➡️ @gajim

You can download it from the official site at gajim.org

Mastodon

A newer server operated by the Mastodon gGmbH non-profit