1
Prose
prose.orgAlso covers messaging
Prose offers an open source alternative to Slack and Teams, with plans and information for large nonprofits and education groups.
Alternatives
The Best Slack Alternatives in 2026
24 alternatives6 free · 4 open source
Looking for something like Slack? Here are 24 alternatives, ranked by how closely they match it on purpose, features and platforms. Of these, 6 are free or have a free plan and 4 are open source.
Slack provides team communication with an interface described as faster and more organized than email.
Top picks at a glance
First suggestionProseProse offers an open source alternative to Slack and Teams…Free or freemium optionMumbleMumble provides free open source, low-latency voice…Open source optionAltusThe Altus desktop client packages WhatsApp Web with themes…
Quick comparison
| # | Alternative | Pricing | Open source | Platforms |
|---|---|---|---|---|
| 1 | Prose | — | Not stated | Web |
| 2 | Altus | — | Yes | Windows, macOS, Linux |
| 3 | matterbridge | — | Yes | — |
| 4 | Mumble | Free | Not stated | macOS, Web, Windows |
| 5 | TeaSpeak | Free | Not stated | Web, Windows, Linux |
| 6 | Twist | — | Not stated | Web |
| 7 | TeamSpeak | — | Not stated | Web |
| 8 | Sila | — | Not stated | iOS, Web |
| 9 | WeeChat | — | Yes | Linux, macOS, Windows |
| 10 | Zulip | — | Yes | — |
All Slack alternatives
2
Also covers messaging · open source
The Altus desktop client packages WhatsApp Web with themes and notifications, providing a desktop interface for messaging.
3
Also covers messaging · open source
Matterbridge connects chat platforms including IRC, Slack, Discord, Telegram, Matrix, and Mattermost through message bridges.
4
Also covers messaging · free
Mumble provides free open source, low-latency voice communication for online groups and gaming sessions.
5
Also covers messaging · free
TeaSpeak provides VoIP communication through web and native clients, with project pages for downloads and community support.
6
Twist
twist.comAlso covers messaging
Twist organizes team collaboration through asynchronous written conversations in a messaging app.
7
TeamSpeak
teamspeak.comAlso covers messaging
TeamSpeak provides voice communication across platforms, supporting online group conversations.
8
Sila
silahq.comAlso covers messaging
Sila provides messaging for teams and AI agents to work together in the same conversations.
9
Also covers messaging · open source
WeeChat is a fast, light and extensible chat client with a text-based user interface.
10
Also covers messaging · open source
Zulip provides an open-source team chat server and web application for team collaboration and focused discussions.
11
Profanity
github.com/profanity-im/profanityAlso covers messaging
Profanity lets users connect to XMPP messaging services from a terminal interface.
12
Also covers messaging · same kind of online tool · free
Fluxer provides free and open source messaging for friends, groups, and communities through a chat app.
13
Also covers messaging · free plan
Proton Meet provides video calls with privacy protections from the creators of Proton Mail, supporting online meetings.
14
Servers
tatsumoto-ren.github.io/blog/list-of-matrix-se…Also covers messaging
Browse a list of Matrix servers, with this page included among resources for learning Japanese.
15
XMPP Clients / Resources
xmpp.org/getting-startedAlso covers messaging
This guide helps newcomers start chatting with XMPP by explaining how to choose and use compatible clients.
16
Servers
fluxerservers.comAlso covers messaging
This directory helps users discover Fluxer servers and bots, presenting communities and automated accounts in one place.
17
Talky
talky.ioAlso covers messaging
Talky offers group video chat and screen sharing through a simple browser-based meeting page.
18
Also covers messaging · free
SimpleX Chat is an encrypted messenger without user IDs, where people can connect through a link or QR code to message and call.
19
Tools / Resources
awesome-fluxer.comAlso covers messaging
This community-maintained list collects Fluxer projects and libraries, with a table of contents to help browse resources.
20
Also covers messaging · free
Jitsi provides free, open-source video conferencing for the web and mobile, with options to host calls or integrate the software.
21
xabber
xabber.comAlso covers messaging
Xabber provides open source XMPP chat on Android and the web, including account registration and messaging features.
22
Videolink2me
videolink2me.comAlso covers messaging
Videolink2me creates browser-based video call links without signup or downloads, letting participants join through a shared URL.
23
Linkello
call.linkello.comAlso covers messaging
Linkello creates audio and video call links, letting users start a call by sharing a web address.
24
Bots
fluxbase.devAlso covers messaging
This Fluxer directory helps users discover bots, grouping listings under utility, music, fun, moderation, and game categories.
No alternatives match this filter.
Alternatives to similar tools
Proton Meet24 alternativesAltus24 alternativesmatterbridge24 alternativesProse24 alternativesZulip24 alternativesXMPP Clients / Resources24 alternatives
What is the best alternative to Slack?
Based on features, tags and platforms, the closest alternatives to Slack are Prose, Altus, and matterbridge.
Is there a free alternative to Slack?
Yes. Mumble, TeaSpeak, and Fluxer are free or offer a free plan.
Are there open-source alternatives to Slack?
Yes: Altus, matterbridge, WeeChat, and Zulip.
Alternatives are suggested from the purpose and features described in our listings. Different pages for the same product appear once. Read each description to check whether it fits your task. How we choose alternatives · Suggest an alternative