Riot.im Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both public and private and provides messaging... Free Open Source Linux Web Android iPhone iPad ... Self-Hosted Chrome Safari F-Droid Firefox Decentralized End-to-end encryption Group chat Matrix.org protocol ... Built-in File transfer Encrypted chat GitHub integration Group collaboration Self Hosted Feature Server Moderation Server side history Slack integration Team Collaboration Video calling Voice Call Add a feature 151 Like
Mattermost Mattermost is an open source, self-hosted Slack alternative. As an alternative to proprietary SaaS messaging, Mattermost brings... Free Open Source Mac OS X Windows Linux Android iPhone ... Android Tablet iPad Self-Hosted JavaScript Go (Programming Language) Cloudron Team Collaboration Data API Group chat Integrated File Sharing ... MarkDown support On-premises software Plugin API Slack integration Add a feature 115 Like
Matrix.org Matrix is an open standard for decentralized persistent communication over IP. It can be used for decentralised group chat, WebRTC signaling, IoT-data transfer, ... Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted WebRTC Python JavaScript Go (Programming Language) Java Perl End-to-end encryption Decentralized Chat Bot Distributed ... Encrypted chat GNU/linux-libre Group chat Real time collaboration Server side history Team Collaboration WebRTC Add a feature 73 Like
HipChat HipChat is an instant messaging service designed for companies and teams. It has persistent chat rooms, one-to-one chat, searchable chat history, file sharing via drag... Freemium Mac OS X Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Apple Watch Team Collaboration Integrated File Sharing Share your screen Add a feature 72 Like
Zulip Zulip is a group chat app. Its most distinctive characteristic is that messages are threaded by topic, helping you have long-running, organized conversations.... Free Open Source Mac OS X Windows Linux Web Android ... iPhone BSD Self-Hosted Threaded Conversations Group collaboration Chat Bot Community based ... GitHub integration Group chat Integrated File Sharing MarkDown support Team Collaboration Add a feature 109 Like
Kontalk Kontalk is an open source replacement for WhatsApp. Server and client software are open and hosting your own server is possible but not required. All communication is... Free Open Source Android Self-Hosted No features added Add a feature 26 Like
Cyanide Cyanide is Tox client for Sailfish OS . Features 1v1 messaging DNS discovery ... Free Open Source Self-Hosted Sailfish OS No features added Add a feature 9 Like
Webogram Webogram is an unofficial Telegram web app. Telegram offers great apps for mobile communication. It is based on the MTProto protocol and has an Open API and... Free Personal Mac OS X Windows Linux Chrome OS Self-Hosted No features added Add a feature 7 Like
Tinode Open source instant messaging server and clients. Backend in pure Go (license GPL 3.0), client-side binding in Java for Android and Javascript (license Apache 2.0)... Free Open Source Web Android Self-Hosted Ad-free Group chat Real time collaboration Add a feature 2 Like
VideoMeeting VideoMeeting is a free and open source video conference solution built to have video calls and chats using your web browser. It is a pure web application based on WebRTC... Free Open Source Web Chrome OS Self-Hosted Video calling Add a feature 2 Like
PWRTelegram bot API Boosted version of the telegram bot API. It has all of the official telegram bot API features plus: - Downloading of files up to 1.5 GB in size - Anonymous file... Free Open Source Web Telegram Self-Hosted No features added Add a feature 1 Like
d-note d-note is a self destructing notes web application that you can run on your own server. A message is created using the web form, and when submitted, a link is returned... Free Open Source Self-Hosted Flask Self destructing messages Add a feature 1 Like Discontinued App no longer accessible: https://github.com/atoponce/d-note
