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instant-messaging (77)

Actor platform
The Actor platform allows you to run a server for clients running the free software Actor messaging and group chat app on their computers and other devices. NB: Actor platform needs other modules in order to work, which is not covered by this entry.
BlockSignal is a secure instant messaging application based on Signal Android. Moreover, it uses a blockchain-based PKI system, Blockstack, to verify the identities of users so as to prevent Man-in-the-Middle attacks instead of Signal's authentication ceremony feature. Therefore, its security level depends on user awareness less.
Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging apps, Briar doesn't rely on a central server - messages are synchronized directly between the users' devices. If the internet's down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the internet's up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.
Coccinella is a Jabber client with a whiteboard. The whiteboard is a shared desktop which supports text, drawings, images, and multimedia in a number of formats, such as MP3 and video. It runs in two modes: a peer-to-peer configuration and a mode compatible with the Jabber Instant Messaging system. A flexible plugin architecture support additional formats.
Multiplatform raster graphical editor enabling simultaneous drawing between users. Project including several sub projects as server, painting framework, network library, desktop application and protocol design and documentation.
Conversations is a Jabber/XMPP client for Android 4.0+ smartphones that has been optimized to provide a unique mobile experience. A port to iOS is envisaged in the medium-term future. Conversations allows you to easily send images, show if your contact has received and read your message, permit dynamic history and handles multiple devices (especially sync with desktop clients), allow you to create group chats and support one-to-one Audio/Video calls ! And thanks to the XMPP Protocol (that is a push protocol) you battery life is safe. Conversations also does not require a Google Account or specifically Google Cloud Messaging (GCM). Using the XMPP federated protocol, you can freely choose a trustworthy server (your own if you want) for yourself while still chatting with contacts that are using other servers. The communication between Conversations and the XMPP server as well as the communication between the individual servers is TLS encrypted. This way, not only your messages are safe but more importantly it is impossible for an outside attacker to intercept your meta data (with whom you are chatting) without attacking your server first. On top of that, Conversations gives you the choice to enable one of two end-to-end encryption mechanisms. The first one is OMEMO, a state of the art multi-end-to-multi-end encryption method which is very easy to setup and gives you forward secrecy and plausible deniability. For backwards compatibility reasons Conversations also supports OpenPGP. F-droid version: Installing the F-Droid client to get the app and timely app update notifications is highly recommended by the developers.
Delta Chat
Delta Chat is a project that aims to create a messaging app that is completely compatible to the existing email-infrastructure. So, with Delta Chat you get the ease of well-known messengers with the reach of email. Moreover, you’re independent from other companies or services - as your data are not related to Delta Chat, you won’t even add new dependencies here.
'ejabberd' is a multi-platform, scalable, distributed, and fault-tolerant XMPP Jabber server. It supports advanced features such as multi-user chat, IRC transport, publish and subscribe services, Jabber user directory, a Web-based administration interface, an HTTP polling service, SSL and TLS support, LDAP and external authentication.
Ekiga (formely known as GnomeMeeting) is a SoftPhone, Video Conferencing and Instant Messenger application over the Internet. It supports HD sound quality and video up to DVD size and quality. It is interoperable with many other standard compliant software, hardware and service providers as it uses both the major telephony standards (SIP and H.323).
Empathy is a messaging program which supports text, voice, and video chat and file transfers over many different protocols, including Jabber (xmpp). You can tell it about your accounts on all those services and do all your chatting within one application. Empathy uses Telepathy for protocol support and has a user interface based on Gossip. Empathy is the default chat client in current versions of GNOME, making it easier for other GNOME applications to integrate collaboration functionality using Telepathy.

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