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RocketChat - The ultimate open source web chat platform
Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework. It is a great solution for communities and companies wanting to privately host their own chat service or for developers looking forward to build and evolve their own chat platforms. Its features include File sharing, Video conferencing, Screen sharing, Live chat, Link preview and lot more.
chat chat-server screen-sharing video-conference slack-alternativeSignal-Android - A private messenger for Android, alternative to WhatsApp
Signal is a messaging app for simple private communication with friends. Signal uses your phone's data connection (WiFi/3G/4G) to communicate securely, optionally supports plain SMS/MMS to function as a unified messenger, and can also encrypt the stored messages on your phone.
chat instant-messaging im secure-chat whatsapp-alternativePidgin - The Universal Chat Client
Pidgin is an instant messaging program which lets you log in to accounts on multiple chat networks simultaneously. It runs on Windows, Linux, and other UNIX operating systems. Pidgin is compatible with the following chat networks out of the box: AIM, ICQ, Google Talk, Jabber/XMPP, MSN Messenger, Yahoo!, Bonjour, Gadu-Gadu, IRC, MXit, Novell GroupWise Messenger, Lotus Sametime, SILC, SIMPLE, MySpaceIM, and Zephyr.
instant-messging xmpp chat jabberejabberd - Robust, Scalable and Extensible XMPP Server
ejabberd is a distributed, fault-tolerant technology that allows the creation of large-scale instant messaging applications. The server can reliably support thousands of simultaneous users on a single node and has been designed to provide exceptional standards of fault tolerance. As an open source technology, based on industry-standards, ejabberd can be used to build bespoke solutions very cost effectively.
xmpp jabber messaging-server im chat chat-server distributed real-timeEkiga - Software Phone and Video Cnferencing Application
Ekiga (formely known as GnomeMeeting) is an open source SoftPhone, Video Conferencing and Instant Messenger application over the Internet. It provides Audio and Video free calls through the internet. It supports standard telephony features like Call Hold, Call Transfer, Call Forwarding, Call Histroy and Call Monitoring.
voip skype-alternative internet-phone sip chatGitter - Community for Software Developers
Gitter is designed to make community messaging, collaboration and discovery as smooth and simple as possible. You can easily create, organise and grow your communities, inviting others to join just in one click. Gitter is an instant messaging and chat room system for developers and users of GitHub repositories. Gitter is similar to IRC and Slack. Unlike IRC, and like Slack, it automatically logs all messages in the cloud.
chat instant-messaging im slack-alternative secure-chatHublin - An easy and free video conference service
Hubl.in is a free and open source video conference solution built with love and designed with ethics in mind. It's the best way to initiate a communication anywhere with anybody and brings real time conversation to the next level. Hubl.in allows free communication without additional plugins.
video-conference video-chat webrtc im chat conferenceRiot - Messaging and Colloboration made easy
Riot is built on top of Matrix. Matrix is an open network for secure, decentralized communication delivering a community of users,bridged networks, integrated bots and applications plus full end-to-end encryption. Riot allows teams to communicate across a wide range of collaboration apps. If some team members use Riot while others use IRC, Slack or Gitter, Riot will allow these team members to seamlessly work together. Riot offers the richest network of communication bridges.
instant-messaging chat secure-chat mobile-apps group-chat colloboration voip video-conferenceZulip - Group Chat
Zulip is a powerful, open source group chat application. It supports both private messaging and group chats via conversation streams. Zulip also supports fast search, drag-and-drop file uploads, image previews, group private messages, audible notifications, missed-message emails, desktop apps, and much more.
chat im instant-messaging group-chat collaborationMongooseIM - Efficient XMPP server
MongooseIM is aimed at large, complex enterprise level projects where real-time communication is critical for business success. It provides high availability, ease of deployment, development and reliability in production. MongooseIM can accept client sessions over vanilla XMPP, Websockets, and HTTP long-polling (a.k.a. BOSH).
xmpp instant-messaging chat multi-user-chat messaging websocketsMattermost - Self-hosted Team Communication Service
Mattermost is self-hosted team communication service bringing messaging and file sharing into one place, accessible across PCs and phones, with archiving and search.
chat chat-server slack-alternative collaboration communication messagingKiwiIRC - Web based IRC client
Kiwi IRC is a fully featured IRC client that can be extended to suit almost any needs. Using the web application is extremely simple even without any IRC knowledge as all the common needs are built directly into the UI.
irc-client web-irc chatMatrix - Decentralized group communication
Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distributing and persisting JSON over an open federation of servers. It can be used for Decentralised Group Chat, WebRTC signalling, Internet of Things, VOIP etc.
voip webrtc skype-alternative video-conference slack-alternative instant-messaging chatChatSecure - Encrypted chat client for iOS and Android
ChatSecure is a instant messaging client for iOS and Android that integrates encrypted OTR ("Off the Record") messaging support from the libotr library and the XMPPFramework to handle Jabber/GTalk (XMPP).
instant-messaging chat secure-chat im-client jabber xmpp mobile-appsBigbluebutton - Open Source Web Conferencing
BigBlueButton is an open source web conferencing system for distance education. It supports sharing of slides (PDF and any document readable by OpenOffice), webcams, whiteboard, chat, voice over IP (using FreeSWITCH), and presenter's desktop. It can record and playback sessions (slides, audio, and chat), runs on Mac, Unix, and PC computers, and is supported by a community of developers that care about good design and a streamlined user experience.
video-conference web-conferencing conference desktop-sharing e-learning collaboration chatHubot - A Chat Bot for your Company
Hubot is a chat bot, modeled after GitHub's Campfire bot. It is extendable with community scripts and your own custom scripts, and can work on many different chat services.
chat chat-client social imSFLphone - Softphone for Linux
SFLphone is a softphone for Linux. It is SIP compatible and supports Multi-way conferencing, Peer to peer calls, Video calls, Instant Messaging, Multi-line, Call transfer, Call hold, Call recording and lot more. It encrypts voice using SRTP protocol.
voip skype-alternative internet-phone chat sip softphoneMumble - High Quality Voice Chat Software
Mumble is a cross-platform voice over IP application. It is a client - server application where multiple users could use the same server and all their communication is encrypted. It could be used while gaming. It does audio video recording.
voip skype-alternative internet-phone chat voip-server chat-server softphoneJitsi - Video Calls and Chat
Jitsi provides Secure Video calls, Conferencing, Chat, Desktop sharing, Instant Messaging, File transfer support for your favorite OS and IM network. Jitsi lets you connect to Facebook, GoogleTalk, XMPP, Windows Live, Yahoo!, AIM, and ICQ so that you can chat to all your friends in the simplest possible way. It supports IPv6, Secure calls with zRTP, Call history, Call hold etc.
video-conference voip skype-alternative internet-phone sip xmpp chatLinphone - Video SIP phone for Desktop and Mobile
Linphone is an internet phone or Voice Over IP phone (VoIP), it helps to communicate freely with people over the internet, with voice, video, and text instant messaging. Linphone is available for Linux, Windows, MacOSX, and for mobile phones: Android, iPhone, Blackberry. It is using SIP protocol and it is compatible with any voip operator using SIP for its network.
voip skype-alternative internet-phone sip xmpp chat