Team Chat Tools | ToolVitals

Best Team Chat tools by public signals

These picks are computed from scored public evidence. Use the openness column in the ranking to separate OSI-approved, source-available, open-core, proprietary, and unverified-license tools.

Best overallMattermost97 score License-safe pickMattermostOSI-approved OSS Fastest shippingMattermost97 shipping

Use Case Rankings

Ordered by ToolVitals score, then health, shipping, confidence, GitHub stars, and name.

#	Tool	Health	Shipping	Openness	Stars	Score	Status
01	Mattermost Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..	98	97	OSI-approved OSS	39.1k	97	Active
02	Rocket.Chat The Secure CommsOS™ for mission-critical operations	97	97	OSI-approved OSS	46.1k	97	Active
03	Element Enterprise communication platform	97	97	OSI-approved OSS	13.5k	97	Active
04	Discourse A platform for community discussion	97	96	OSI-approved OSS	47.8k	97	Active
05	Zulip Zulip server and web application. Open-source team chat that helps teams stay productive and focused.	97	96	OSI-approved OSS	25.9k	97	Active
06	Vexa Open-source meeting transcription API for Google Meet, Microsoft Teams & Zoom. Auto-join bots, real-time WebSocket transcripts, MCP server for AI agents. Self-host or use hosted SaaS.	96	97	OSI-approved OSS	2.8k	96	Active
07	Chatmail Core Core library for chatmail apps, bots, and bindings.	96	96	OSI-approved OSS	929	96	Active
08	Haven Chat Self-hosted private chat — No cloud, no telemetry, no Big Tech. Discord alternative that runs on your own machine.	96	96	OSI-approved OSS	539	96	Active
09	Wire 📱 Wire for iOS (iPhone and iPad)	96	96	OSI-approved OSS	169	96	Active
10	wacli WhatsApp CLI	96	95	OSI-approved OSS	2.7k	95	Active
11	CBoard Browser-based AAC communication board with text-to-speech.	95	95	OSI-approved OSS	756	95	Active
12	Quackback Open source alternative to Canny, UserVoice, Productboard	94	95	OSI-approved OSS	269	95	Active
13	nodyx Self-hosted community platform with forum, chat, voice, and canvas.	93	96	OSI-approved OSS	132	94	Active
14	VACS VATSIM ATC communication system.	93	94	OSI-approved OSS	68	94	Active
15	agentgram Open-source AI agent social network built with Next.js and Supabase.	92	94	OSI-approved OSS	39	93	Active
16	Cap Open source Loom alternative. Beautiful, shareable screen recordings.	91	96	OSI-approved OSS	22.2k	93	Active
17	Gryt Monorepo for the Gryt voice chat platform — a self-hostable, WebRTC-based voice communication app with a desktop client, signaling server, SFU, and Keycloak auth.	91	96	OSI-approved OSS	38	93	Active
18	SimpleX Chat SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!	93	92	OSI-approved OSS	19.4k	92	Active
19	Fluxer A free and open source instant messaging and VoIP platform built for friends, groups, and communities. Self-hosting and more activity in this repository is coming very soon! See the README.	91	95	OSI-approved OSS	10.3k	92	Active
20	Activist Open-source activism platform.	91	85	OSI-approved OSS	746	89	Active
21	Mqvi Open-source communication platform with voice, video, text, and screen sharing.	86	92	OSI-approved OSS	18	89	Active
22	Frappe Gameplan Open Source Discussions Platform for Remote Teams	90	86	OSI-approved OSS	516	88	Active
23	Hackers Pub ActivityPub-enabled social network for hackers.	89	86	OSI-approved OSS	162	88	Active
24	Lemmy 🐀 A decentralised discussion platform for communities.	89	85	OSI-approved OSS	14.6k	88	Active
25	Ethora Open-source engine for chat 💬, AI assistants 🤖 & wallets 🪪. React, Typescript, Python, XMPP. Build future apps with chat, AI agents and web3.	86	87	OSI-approved OSS	544	86	Active
26	nChat White-label team communication platform for Slack, Discord, or Telegram style chat.	86	87	OSI-approved OSS	0	86	Active
27	HappyDeliver Open-source email deliverability testing platform.	84	83	OSI-approved OSS	227	83	Active
28	WhippyTerm Modern Serial Terminal	80	76	OSI-approved OSS	94	79	Active
29	Open Self Service Open source composable frontend for customer portals.	81	72	OSI-approved OSS	181	77	Active
30	adamant-im ADAMANT Decentralized Messenger and Crypto Wallet. Progressive Web Application (PWA) for Web, Tor, Android, macOS, Windows, and Linux.	80	68	OSI-approved OSS	784	75	Active
31	Habitat Free and open-source self-hosted social platform for local communities.	77	70	OSI-approved OSS	149	74	Active
32	Tinode General instant messaging	76	61	OSI-approved OSS	13.5k	70	Active
33	Majik Message Post-quantum secure messaging platform.	69	71	OSI-approved OSS	2	70	Warning
34	Open IM IM Chat OpenClaw	73	57	OSI-approved OSS	16.7k	67	Warning
35	QuoteVote Nonprofit open-source platform to post, vote, and deliberate.	69	59	OSI-approved OSS	35	65	Warning
36	Set Outlook Signatures Data sovereign email signatures and out-of-office reply management.	68	59	OSI-approved OSS	411	64	Warning
37	Circled Video calls, chat, photo sharing, and community server platform.	63	47	OSI-approved OSS	210	56	Warning
38	Indic Subtitler Open source subtitling platform for transcribing and translating videos and audio in Indic languages.	49	25	OSI-approved OSS	94	40	Critical
39	CajeerBots Platform for launching, managing, and extending chat bots.	49	22	OSI-approved OSS	0	38	Critical
40	Late.fyi Email-driven train tracker with notifications by email or ntfy.	38	21	OSI-approved OSS	0	31	Critical
41	Discuit Open-source community discussion platform.	34	13	OSI-approved OSS	551	26	Critical
42	NPMChat Open-source real-time chat platform for developers and teams.	16	0	OSI-approved OSS	20	10	Critical
43	Vanilla A platform for community discussion	15	0	OSI-approved OSS	3k	9	Critical
44	Deskive Open-source workspace collaboration platform with chat, video calls, projects, files, calendar, notes, and AI tools.	15	0	OSI-approved OSS	30	9	Critical
45	Weevean Open-source team collaboration platform with real-time messaging, channels, and DMs.	15	0	OSI-approved OSS	13	9	Critical
46	OpenCom A simple Open Source communication Platform	13	2	OSI-approved OSS	5	9	Critical
47	Colanode Open-source and local-first Slack and Notion alternative that puts you in control of your data	12	3	OSI-approved OSS	5.1k	8	Critical
48	Spacebar 📬 Spacebar is a free open source selfhostable discord compatible communication platform	11	0	OSI-approved OSS	6.7k	7	Critical

Not Scored

Tracked for context, but excluded from rankings because comparable open/source-visible evidence is unavailable.

Campsite

Async team communication platform for remote and distributed teams.

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.

Chativa

Self-hosted end-to-end encrypted messaging platform for SMEs.

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.

Discord

Voice and text chat for communities

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.

Firma Sign

Peer-to-peer document signing tool.

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.

Helpdesk

Open source helpdesk management application.

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.

Mezon

Mezon is a new way to communicate with your team. It's faster, better organized, better for WFH.

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.

Natively - Free open-source AI interview copilot & meeting assistant. The best Cluely alternative, Final Round AI alternative, and Interview Coder alternative. Real-time transcription, undetectable stealth mode, local RAG, BYOK. No subscriptions. No data breaches.

ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.