89 Like Mattermost Good alternative? YES NO Mattermost is an open source, self-hosted Slack alternative. As an alternative to proprietary SaaS messaging, Mattermost brings... Free 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 Add a feature Its the same but you keep your server where you want so no one is playing with your data, and you can have an unlimited history depending on what you need for free so really way better ! Guest • May 2017 • 2 agrees and 0 disagrees Disagree Agree 1. Open source 2. Most of the same functionality 3. Secure and private server possibilities (the data is, therefore, yours until the end of time). 4. Extra features when it comes to customization, a big difference actually. Only negative is that Slack look a lot better design wise, so you can't customize it optimally. Guest • May 2017 Disagree Agree It is very much a Slack clone with added features + is open source! Guest • May 2017 • 0 agrees and 1 disagrees Disagree Agree
104 Like Riot.im Good alternative? YES NO 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 Matrix.org protocol Built-in File transfer Encrypted chat GitHub integration ... Group chat Group collaboration Self Hosted Feature Server Moderation Server side history Slack integration Team collaboration Video calling Voice Call Add a feature
117 Like Wire Good alternative? YES NO Wire is a secure and private messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group chats, file sharing, audio and video messages... Free Open Source Mac Windows Linux Web Android iPhone Android Tablet iPad End-to-end encryption Security focused Encrypted calls Encrypted chat Group chat Integrated File Sharing ... Photo Sharing Share your screen Video calling Voice Call WebRTC Add a feature
60 Like Rocket.Chat Good alternative? YES NO 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 Voice messages Add a feature
51 Like Matrix.org Good alternative? YES NO 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 Chat Bot Decentralized Encrypted chat End-to-end encryption Group chat Real time collaboration ... Server side history Team collaboration WebRTC Add a feature
33 Like Let's Chat Good alternative? YES NO 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
23 Like Zulip Good alternative? YES NO 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 BSD Self-Hosted GitHub integration Group chat Group collaboration Integrated File Sharing Team collaboration Add a feature
20 Like Gitter Good alternative? YES NO Gitter is a chat and collaboration tool for developers and users. It's a place for developers to talk. KEY FEATURES - Unlimited public chat rooms for free -... Free Open Source Mac Windows Linux Web Android iPhone Real time collaboration Add a feature
17 Like Hack Chat Good alternative? YES NO hack.chat is a minimal, distraction-free chat application. Channels are created and joined by going to https://hack.chat/?your-channel . There are no channel lists, so a... Free Open Source Web Android Self-Hosted Distraction-free UI Add a feature
15 Like kune Good alternative? YES NO kune is a social network where you can communicate, collaborate and share between equals, using different web tools: documents, calendars, chats, wiki, messages, tasks... Free Open Source Web Decentralized Group chat Real time collaboration Add a feature
9 Like Kandan Good alternative? YES NO Open Source private chat server. Your own private Chat server in minutes, plus additional features. No credit card required. A fast, secure and stable solution based on... Free Open Source Web Self-Hosted Ruby on Rails No features added Add a feature
8 Like ScudCloud Good alternative? YES NO ScudCloud is a non official open-source Ubuntu desktop client for Slack. Free Open Source Linux Linux Mint Kubuntu Ubuntu No features added Add a feature
9 Like MongooseIM platform Good alternative? YES NO The massively-scalable XMPPJabber mobile messaging platform, for mobile and web, by Erlang Solutions. Free Open Source Mac Linux Amazon Web Services Microsoft Azure Voice Call Add a feature
4 Like ZeroChat Good alternative? YES NO 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
2 Like Glowing Bear Good alternative? YES NO Glowing Bear is a sleek, modern web frontend that securely connects to a running instance of WeeChat using its built-in relay protocol. It relies on WeeChat to do all... Free Open Source Mac Windows Linux Web Android Android Tablet Self-Hosted Chrome ... WeeChat Firefox OS Google Play Store Firefox Responsive design Add a feature
