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 Mac Windows Linux Web Android ... iPhone iPad Self-Hosted Chrome Safari F-Droid Firefox End-to-end encryption Decentralized Group chat Matrix.org protocol ... Video calling Voice Call Community based Custom widgets DRM Free Encrypted chat GitHub integration Group collaboration Integrated File Sharing MarkDown support File Sending Server Moderation Server side history Slack integration Team Collaboration Video calling Add a feature 177 Like It's like Skype but has open groups like Teamspeak and it has unlimited fileupload. Thanks to a server to server structure, everyone can text everyone. MasteLrugarius • Nov 2016 Disagree Agree Free, opensource and encrypted, with federation support and can be hosted on your servers. Murz • Aug 2017 • 1 agrees and 1 disagrees Disagree Agree
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 Data API Group chat Integrated File Sharing ... MarkDown support On-premises software Plugin API Slack integration Supports XMPP Add a feature 130 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 89 Like Feature-full modern free opensource instant messaging server with federation. Murz • Aug 2017 • 1 agrees and 0 disagrees Disagree Agree
Rocket.Chat Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework. Free Open Source Mac Windows Linux Android iPhone ... Self-Hosted Cloudron Ad-free Chat Bot Extensible by Plugins/Extensions Group chat ... Integrated File Sharing Location Mapping Share your screen Self-Serve Capability Voice messages Add a feature 74 Like Good alternative to Slack because it is free and self-hosted. edlee • Dec 2016 Disagree Agree
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 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 MarkDown support Team Collaboration Add a feature 122 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 Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Apple Watch Team Collaboration Integrated File Sharing Share your screen Add a feature 73 Like Discontinued https://alternativeto.net/software/slack/ is acquiring Hipchat and https://alternativeto.net/software/stride-by-atlassian/ from Atlassian. the services will be discontinued after February 15th, 2019. https://www.atlassian.com/partnerships/slack
Let's Chat Self-hosted chat for small teams. Features and Stuff BYOS (bring your own server) Persistent messages Multiple rooms New message alerts /... Free Open Source Self-Hosted Cloudron Team Collaboration Add a feature 36 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... Free Personal Mac Windows Linux Web Android ... iPhone Self-Hosted Encrypted chat Reactions Real time collaboration Team work ... Text chat Add a feature 24 Like
ZeroChat An IRC-like internet chatroom hosted on ZeroNet, a distributed network. 0rc is a fully distributed website, and messages are shared through peers using the ZeroNet... Free Open Source Mac Windows Linux Web Self-Hosted ... Python JavaScript ZeroNet Decentralized Distributed Add a feature 7 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
TribeScale TribeScale is a startup that aims to enhance teamwork in companies through the improvement of communication, coordination, and the pace on the basis of targets set. Free Mac Windows Web Android iPhone ... iPad Self-Hosted Goal setting Goal Tracking Group chat Group collaboration ... Real time collaboration Team Collaboration Team work Add a feature 24 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
Thirdlane Connect Thirdlane Connect helps modern teams to be more effective by bringing together voice, messaging, video, and applications integrations. Free Mac Windows Linux Web Android ... Self-Hosted Integration with CRMs Group chat Salesforce integration Share your screen ... Voice Call WebRTC Zendesk integration Add a feature 2 Like
TrueConf Free software on-premises video conferencing server with strong UC capabilities and native apps for all major platforms. Freemium Mac Windows Linux Web Android ... iPhone iPad Self-Hosted Apple Watch Share your screen Video calling Add a feature 4 Like
NextCloud Talk Screensharing, online meetings & web conferencing without data leaks. Running over your own Nextcloud server. Free Personal Open Source Web Android iPhone iPad Self-Hosted End-to-end encryption Group chat Share your screen Add a feature 1 Like
