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 Open source software Voice Call ... Custom widgets Federated Group chat Matrix.org protocol Open Source apps 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 Message edit Message redaction Mobile friendly Moderation tools Per-room avatars Privacy-friendly Read receipts Self-hosted in intranet or private cloud File Sending Server Moderation Server side history Slack integration Social network Team Collaboration Text chat Typing notifications User mentions Video/Audio Calling Video calling Voice chat Web Integaration Add a feature

276 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 Decentralized Voice chat Chat Bot ... Distributed Encrypted chat Group chat Random video chat Real time collaboration Server side history Team Collaboration Voice Call WebRTC Add a feature

145 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 • 4 agrees and 0 disagrees
- Zulip's topics feature is great. vedarshshah • Dec 2017 • 3 agrees and 0 disagrees
- Powerful and user-friendly chat platform with extra productivity benefits of threaded conversation HaricharanSrinivasan • Dec 2017 • 2 agrees and 0 disagrees
Free Open Source Mac Windows Linux Web Android ... iPhone Android Tablet BSD Self-Hosted
Threaded Conversations Group collaboration Open source software Chat Bot ... Community based GitHub integration Group chat Integrated File Sharing Live topics MarkDown support Team Collaboration Todos Add a feature

147 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

98 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 Integrated File Sharing Share your screen Add a feature

74 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

72 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
Team Collaboration Add a feature

37 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 Voice chat Add a feature

27 Like
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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 Group chat Group collaboration Live Chat ... Support for @mentions Real time collaboration Team Collaboration Team work Add a feature

9 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 Python Add a feature

10 Like