Alternatives to Mattermost for Self-hosting with any license

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...
- Federated, bridged with many IRC networks. nrg200 • Jun 2017 • 1 agrees and 0 disagrees
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 Custom widgets ... Federated Group chat Matrix.org protocol User Management Video calling Add-ons Clean design Community based Direct Messaging DRM Free Encrypted chat GitHub integration Group collaboration Integrated File Sharing MarkDown support Mobile friendly Privacy-friendly Self-hosted in intranet or private cloud File Sending Server Moderation Server side history Slack integration Team Collaboration Video calling Web Integaration Add a feature

248 Like
Matrix.org

Matrix defines a set of open APIs for decentralised communication, suitable for securely publishing, persisting and subscribing to data over a global open federation of...

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 Chat Decentralized Chat Bot ... Distributed Encrypted chat GNU/linux-libre Group chat Java Real time collaboration Server side history Team Collaboration Voice Call WebRTC Add a feature

126 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....
- Zulip has more potential than Mattermost. Zulip is also an open source alternative to Slack but approached in a different manner. Sethu • Dec 2017 • 3 agrees and 0 disagrees
- Zulip's topics feature is great. vedarshshah • Dec 2017 • 2 agrees and 0 disagrees
- Powerful and user-friendly chat platform with extra productivity benefits of threaded conversation HaricharanSrinivasan • Dec 2017 • 1 agrees and 0 disagrees
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

141 Like
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
Group chat Live Chat Video Conferencing Ad-free ... Channels Chat Bot Extensible by Plugins/Extensions Integrated File Sharing Location Mapping Share your screen Self-Serve Capability Slack integration Voice messages Add a feature

90 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...
- 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
Freemium Mac Windows Linux Web Android ... iPhone Android Tablet iPad Self-Hosted Apple Watch
Team Collaboration Chat Integrated File Sharing Share your screen Add a feature

73 Like
fluxday

Opensource task & productivity management tool for startups, engineered based on the concepts of OKR. In fluxday, you can start by creating the departments of...

Free Open Source Web MySQL Community Edition Self-Hosted MariaDB Ruby
Task Management Add a feature

71 Like
Let's Chat

Self-hosted chat for small teams. Features and Stuff BYOS (bring your own server) Persistent messages Multiple rooms New message alerts /...
- Discontinued As stated at https://github.com/sdelements/lets-chat/issues/781 , the project is no longer developed since August 2017. Last version, 0.4.0, released in June 2015, can be still downloaded from GitHub together with the source code.
Free Open Source Self-Hosted Cloudron
Chat 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 Software as a Service (SaaS)
Encrypted chat Reactions Real time collaboration Security & Privacy ... Team work Text chat Add a feature

25 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

10 Like
Hack Chat

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
Chat Distraction-free UI Add a feature

20 Like
Spectrum Chat

A newly open sourced self hosted Slack like alternative for building persistent chat communities.

Freemium $ $ $ Open Source Web Self-Hosted Software as a Service (SaaS)
Channels Chat Group chat Group collaboration ... Live Chat Support for @mentions Real time collaboration Team Collaboration Team work 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.
- Discontinued Website and app unavailable.
Free Mac Windows Web Android iPhone ... iPad Self-Hosted
Goal setting Goal Tracking Group chat Group collaboration ... Real time collaboration Task Management Team Collaboration Team work Add a feature

24 Like
dirc

Peer-to-peer IRC-inspired self-hosted serverless web browser chat. Chat from your browser.

Free Open Source Mac Windows Linux Web Android ... iPhone Chrome OS Self-Hosted
Chat Group chat Live Chat Add a feature

2 Like
Glowing Bear

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 Web-Based Add a feature

3 Like