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... besides what is already mentioned, it's a client for matrix which is a chat network attempting to connect people from different platforms (also using bridges) and it's decentralized. Easy to use, perfect for geeks, though! Guest • May 2018 • 3 agrees and 1 disagrees Disagree Agree Decentral (federation), sure. Open source - client, protocol and server User6044478 • May 2018 • 2 agrees and 1 disagrees Disagree Agree It is open source, encrypted (end to end), the server is also open source, which means that you or your university could run the server for you. This last point makes it very solid in the long run (like email survived because the protocol was federated). Guest • Feb 2017 • 9 agrees and 3 disagrees Disagree Agree Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Chrome Safari F-Droid Firefox Apps with End-to-End Encryption Decentralized Voice Call Group chat ... Matrix.org protocol Video calling Clean design Community based Custom widgets Direct Messaging DRM Free Encrypted chat GitHub integration Group collaboration Integrated File Sharing MarkDown support Mobile friendly File Sending Server Moderation Server side history Slack integration Team Collaboration Video calling Web Integaration Add a feature 226 Like
Mattermost Mattermost is an open source, self-hosted Slack alternative. As an alternative to proprietary SaaS messaging, Mattermost brings... Freemium $ $ $ Open Source Mac Windows Linux Android iPhone ... Android Tablet iPad Self-Hosted JavaScript Go (Programming Language) Cloudron Team Collaboration Group chat Data API Integrated File Sharing ... MarkDown support Multi Channel On-premises software Plugin API File Sending Slack integration Supports XMPP Add a feature 154 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, ... You can choose, which client you like the most and use it Guest • May 2018 • 0 agrees and 2 disagrees Disagree Agree Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted WebRTC Python JavaScript Go (Programming Language) Java Perl Apps with End-to-End Encryption Decentralized Chat Bot Distributed ... Encrypted chat GNU/linux-libre Group chat Real time collaboration Server side history Team Collaboration Voice Call WebRTC Add a feature 117 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.... Messages seperated by streams and topics hrishikeshpatil • Jan 2018 Disagree Agree Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet BSD Self-Hosted Threaded Conversations Group collaboration Chat Bot Community based ... GitHub integration Group chat Integrated File Sharing Live topics MarkDown support Team Collaboration Add a feature 138 Like
Kontalk Messenger Kontalk is a secure instant messenger, allowing you to send and receive text, image and voice messages (other file types coming soon) to and from other Kontalk users... Free Open Source Android Self-Hosted Encrypted chat Apps with End-to-End Encryption Add a feature 28 Like
Dialog Messenger Dialog Messenger is a customized self-hosted platform usable across multi operation systems simultaneously. dialog provides SDK tools for client interface as well as for... White-label option is a good touch Guest • Dec 2018 Disagree Agree Free Personal Mac Windows Linux Web Android ... iPhone Self-Hosted Encrypted chat Reactions Real time collaboration Team work ... Text chat Add a feature 25 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 Web-Based Add a feature 4 Like
Tinode Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line... Completely open source and free end-to-end. Download and run. Guest • Dec 2017 Disagree Agree Free Open Source Web Android iPhone Self-Hosted Software as a Service (SaaS) Ad-free Group chat Real time collaboration Add a feature 3 Like
