Open-source, on-prem Slack-alternative. It can be integrated with Gitlab.

Mattermost alternatives and similar software solutions

Based on the "Custom" category

• Rocket.Chat

  9.9 9.7 L3 Mattermost VS Rocket.Chat

  Teamchat solution similar to Gitter.im or Slack.

• Zulip

  9.7 9.9 L2 Mattermost VS Zulip

  Zulip is a powerful, open source group chat application.

• ZeroNet

  9.7 9.6 Mattermost VS ZeroNet

  Open, free, and uncensorable websites, using Bitcoin cryptography and BitTorrent network.

• Tox

  9.4 0.3 L3 Mattermost VS Tox

  A distributed, secure messenger with audio and video chat capabilities.

• Lets-Chat

  9.4 1.3 L5 Mattermost VS Lets-Chat

  A self hosted chat suite written in Node.

• Jitsi Meet

  8.8 9.7 L4 Mattermost VS Jitsi Meet

  Jitsi Meet is an OpenSource

• Synapse

  8.6 9.9 L3 Mattermost VS Synapse

  A server for Matrix, an open standard for decentralized persistent communication.

• Vector

  8.5 9.7 L4 Mattermost VS Vector

  A glossy Matrix web client with an emphasis on performance and usability.

• Actor

  8.4 0.0 L2 Mattermost VS Actor

  Actor is an open source fast open source messaging platform with rich mobile and web clients.

• Centrifugo

  8.3 8.3 Mattermost VS Centrifugo

  Language-agnostic real-time messaging

• Mumble

  8.0 8.2 L1 Mattermost VS Mumble

  Low-latency, high quality voice/text chat software.

• Friends

  7.9 0.3 L4 Mattermost VS Friends

  P2P chat powered by the web.

• Kandan

  7.8 0.0 Mattermost VS Kandan

  Kandan is an Open Source Alternative to HipChat.

• hack.chat

  7.6 0.0 L3 Mattermost VS hack.chat

  A minimal, distraction-free chat application.

• Live Helper Chat

  7.3 9.2 L3 Mattermost VS Live Helper Chat

  Live Support chat for your website.

• TextBelt

  7.3 6.7 L3 Mattermost VS TextBelt

  An outgoing SMS API that uses carrier-specific gateways to deliver your text messages for free, and without ads.

• Hubl.in

  7.1 0.0 L3 Mattermost VS Hubl.in

  WebRTC powered video conference, chat and collaborative editor.

• Jitsi Video Bridge

  7.0 9.2 L1 Mattermost VS Jitsi Video Bridge

  WebRTC compatible Selective Forwarding Unit

• RetroShare

  6.4 9.6 L1 Mattermost VS RetroShare

  Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.

• Spreed

  6.2 0.0 Mattermost VS Spreed

  WebRTC audio/video calls, conferencing server, and web client.

• Node-Chat

  6.1 0.3 L2 Mattermost VS Node-Chat

  A not-so-basic open-source chat with admin features.

• Broid

  5.7 0.0 Mattermost VS Broid

  Broid enables rich conversations on all messaging channels within a single schema integration using W3C standards.

• Freenet

  5.6 7.9 L1 Mattermost VS Freenet

  Anonymously share files, browse and publish "freesites"

• Scrollback

  5.5 0.0 L3 Mattermost VS Scrollback

  Embeddable cross-platform chat for communities.

• Hawkpost

  5.3 3.4 L5 Mattermost VS Hawkpost

  HawkPost is a web app that lets you create unique links that you can share with a person that desires to send you important information but doesn't know how to encrypt it. The message is encrypted in their browser and sent to your email address.

• Mibew

  5.3 5.8 Mattermost VS Mibew

  Mibew Messenger is an open-source live support application written in PHP and MySQL. It enables one-on-one chat assistance in real-time directly from your website.

• Niltalk

  5.2 0.9 Mattermost VS Niltalk

  A simple, private, persistence-free web based multi-room chat server + client.

• MiAOU

  4.5 7.6 L3 Mattermost VS MiAOU

  A multi-room persistent chat server.

• Spectrum 2

  4.4 8.3 Mattermost VS Spectrum 2

  Spectrum 2 is an open source instant messaging transport. It allows users to chat together even when they are using different IM networks.

• Tuber

  3.9 1.2 L3 Mattermost VS Tuber

  Peer-to-peer video chat that works.

• Pushjet

  3.8 0.0 L5 Mattermost VS Pushjet

  A self hosted push notification service built with a simple API making sending notifications easy.

• Rallly

  3.5 2.3 Mattermost VS Rallly

  Rallly is a free collaborative scheduling service.

• Cherry

  3.3 0.0 Mattermost VS Cherry

  A tiny webchat server.

• Ring

  3.0 7.0 L3 Mattermost VS Ring

  Free software for universal communication which respects freedoms and privacy of its users.

• Matrix Console Web

  2.5 0.0 L3 Mattermost VS Matrix Console Web

  A web client meant to be a showcase of Matrix capabilities, and reference implementation of the Matrix standard.

• Syndie

  2.1 1.9 L1 Mattermost VS Syndie

  Syndie is a libre system for operating distributed forums.

• GNUNet

  2.0 9.8 L2 Mattermost VS GNUNet

  Free software framework for decentralized, peer-to-peer networking.

• KChat

  1.7 0.0 Mattermost VS KChat

  PHP Based Live Chat Aplication.

• Mumblecop

  1.1 - Mattermost VS Mumblecop

  Stream audio from youtube and soundcloud, simulate dice rolls, or write your own commands with a simple plugin format.

* Code Quality Rankings and insights are calculated and provided by Lumnify.
They vary from L1 to L5 with "L5" being the highest. Visit our partner's website for more details.

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