ToolVitals

Communication

💬

Team Chat

Team messaging, communities, and async communication tools.

128 tools tracked, 119 scored verdicts

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 overallRocket.Chat100 score License-safe pickRocket.ChatOSI-approved OSS Fastest shippingRocket.Chat100 shipping
slack vs discordcal com vs calendly

Use Case Rankings

Ordered by ToolVitals score, health, shipping, confidence, and then adoption as a tie-breaker.

# Tool Health Shipping Openness Stars Score Status
01 Rocket.Chat
The Secure CommsOS™ for mission-critical operations
 100 100 OSI-approved OSS 45.5k 100 Active
02 Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
 100 100 OSI-approved OSS 37.6k 100 Active
03 SimpleX Chat
SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!
 98 98 OSI-approved OSS 11.2k 99 Active
04 Chatwoot
Open-source live-chat, email support, omni-channel desk. An alternative to Intercom, Zendesk, Salesforce Service Cloud etc. 🔥💬
 98 95 OSI-approved OSS 30.6k 98 Active
05 Element
Enterprise communication platform
 96 100 OSI-approved OSS 13.2k 98 Active
06 wacli
WhatsApp CLI
 95 95 OSI-approved OSS 2.5k 96 Active
07 Notesnook
A fully open source & end-to-end encrypted note taking alternative to Evernote.
 94 95 OSI-approved OSS 14.1k 96 Active
08 Discord
Voice and text chat for communities
 100 95 Proprietary target — 95 Active
09 Wire
📱 Wire for iOS (iPhone and iPad)
 91 95 OSI-approved OSS 156 95 Active
10 LiveKit
SFU and SDKs for high-performance, scalable WebRTC
 98 84 OSI-approved OSS 19.2k 94 Active
11 Natively
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.
 90 98 OSI-approved OSS 1.4k 94 Active
12 Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
 92 86 OSI-approved OSS 25.4k 92 Active
13 FS PBX
Open-source PBX platform for business telephony and VoIP deployments.
 85 95 OSI-approved OSS 197 92 Active
14 CryptPad
Collaborative office suite, end-to-end encrypted and open-source.
 90 87 OSI-approved OSS 7.7k 91 Active
15 Haven Chat
Self-hosted private chat — No cloud, no telemetry, no Big Tech. Discord alternative that runs on your own machine.
 89 95 OSI-approved OSS 466 91 Active
16 Kamailio
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms, focusing on flexibility, security and scalability
 87 89 OSI-approved OSS 2.8k 91 Active
17 Meet
Open source video conferencing app powered by LiveKit. Built with Django and React.
 86 95 OSI-approved OSS 2.1k 90 Active
18 Jitsi Meet
Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.
 85 89 OSI-approved OSS 29.4k 90 Active
19 Cap
Open source Loom alternative. Beautiful, shareable screen recordings.
 84 90 OSI-approved OSS 19.6k 90 Active
20 Quackback
Open source alternative to Canny, UserVoice, Productboard
 81 95 OSI-approved OSS 125 90 Active
21 Plunk
The Open-Source Email Platform
 87 86 OSI-approved OSS 5.2k 89 Active
22 WPPConnect
WPPConnect is an open source project developed by the JavaScript community with the aim of exporting functions from WhatsApp Web to the node, which can be used to support the creation of any interaction, such as customer service, media sending, intelligence recognition based on phrases artificial and many other things, use your imagination
 87 84 OSI-approved OSS 3.3k 89 Active
23 Lemmy
🐀 A decentralised discussion platform for communities.
 87 82 OSI-approved OSS 14.4k 89 Active
24 Chatmail Core
Core library for chatmail apps, bots, and bindings.
 85 93 OSI-approved OSS 900 89 Active
25 LibreDesk
Open source, self-hosted omnichannel customer support desk. Live chat, email, and more in a single binary.
 85 90 OSI-approved OSS 2.6k 89 Active
26 Keeper
Calendar sync tool & universal calendar MCP server. Aggregate, sync and control calendars on Google, Outlook, Office 365, iCloud, CalDAV or ICS.
 87 83 OSI-approved OSS 1.1k 88 Active
27 FreeScout
FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)
 84 87 OSI-approved OSS 4.3k 88 Active
28 nodyx
Self-hosted community platform with forum, chat, voice, and canvas.
 79 95 License unknown 89 87 Active
29 VACS
VATSIM ATC communication system.
 79 90 OSI-approved OSS 67 87 Active
30 PlugNmeet
The open-source, self-hosted video conferencing software. Scalable, customizable, and with a powerful AI Meeting Agent.
 79 86 OSI-approved OSS 497 87 Active
31 agentgram
Open-source AI agent social network built with Next.js and Supabase.
 74 95 OSI-approved OSS 29 87 Warning
32 DooTask
Open-source online project task management tool with docs, mind maps, flowcharts, IM, and file management.
 81 86 OSI-approved OSS 5.5k 86 Active
33 Modoboa
Mail hosting made simple
 81 82 OSI-approved OSS 3.5k 86 Active
34 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.
 81 81 OSI-approved OSS 2.2k 86 Active
35 GLPI
Open source asset and IT service management/helpdesk software.
 81 80 OSI-approved OSS 6k 86 Active
36 Mailspring
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
 84 81 OSI-approved OSS 17.6k 85 Active
37 Feedbackland
Open-source feedback platform for collecting and managing user input.
 78 82 OSI-approved OSS 15 85 Active
38 Mqvi
Open-source communication platform with voice, video, text, and screen sharing.
 77 90 OSI-approved OSS 15 85 Active
39 Discourse
A platform for community discussion
 85 72 OSI-approved OSS 47.2k 84 Active
40 KumoMTA
The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.
 79 75 OSI-approved OSS 494 83 Active
41 Owncast
Take control over your live stream video by running it yourself. Streaming + chat out of the box.
 79 73 OSI-approved OSS 11.3k 83 Active
42 Ethora
Open-source engine for chat 💬, AI assistants 🤖 & wallets 🪪. React, Typescript, Python, XMPP. Build future apps with chat, AI agents and web3.
 76 77 OSI-approved OSS 536 83 Active
43 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.
 68 90 OSI-approved OSS 36 83 Warning
44 tickets
Minimalist and private ticket sales platform.
 74 82 License unknown 11 81 Warning
45 Cossistant
Open-source, customer support platform with fully customizable AI support agents for developers / startups shipping SaaS.
 78 66 OSI-approved OSS 677 80 Active
46 Habitat
Free and open-source self-hosted social platform for local communities.
 76 73 OSI-approved OSS 133 80 Active
47 TextBee
open-source sms-gateway. turn any android phone into an sms gateway
 76 65 OSI-approved OSS 2.6k 79 Active
48 nChat
White-label team communication platform for Slack, Discord, or Telegram style chat.
 72 71 OSI-approved OSS 0 79 Warning
49 Mezon
Mezon is a new way to communicate with your team. It's faster, better organized, better for WFH.
 84 83 Proprietary target — 78 Active
50 Open Self Service
Open source composable frontend for customer portals.
 80 53 OSI-approved OSS 174 77 Warning
51 CajeerBots
Platform for launching, managing, and extending chat bots.
 70 76 OSI-approved OSS 0 77 Warning
52 Cal.com
Open-source scheduling infrastructure
 80 50 Open core 45.4k 76 Warning
53 Mailu
Self-hosted mail server stack packaged as Docker images.
 77 58 OSI-approved OSS 7.3k 75 Active
54 Pontoon
Mozilla's Localization Platform
 74 59 OSI-approved OSS 1.6k 74 Warning
55 Activist
Open-source activism platform.
 74 65 OSI-approved OSS 693 73 Warning
56 Majik Message
Post-quantum secure messaging platform.
 63 65 OSI-approved OSS 2 73 Warning
57 Set Outlook Signatures
Data sovereign email signatures and out-of-office reply management.
 77 46 OSI-approved OSS 406 72 Warning
58 Znuny
Znuny is a free, open-source, and versatile web-based ticketing system for Customer Service, Help Desk, IT Service Management, and more. It is built for transparency and long-term sustainability and is highly tailorable to your organization's needs.
 72 56 OSI-approved OSS 569 72 Warning
59 NPMChat
Open-source real-time chat platform for developers and teams.
 68 66 OSI-approved OSS 20 72 Warning
60 Hackers Pub
ActivityPub-enabled social network for hackers.
 65 63 OSI-approved OSS 146 71 Warning
61 adamant-im
ADAMANT Decentralized Messenger and Crypto Wallet. Progressive Web Application (PWA) for Web, Tor, Android, macOS, Windows, and Linux.
 76 41 OSI-approved OSS 772 70 Warning
62 Mirotalk
🏆 Self-hosted, open-source WebRTC video conferencing platform for real-time communication and collaboration. A modern alternative to Zoom, built on SFU architecture.
 64 63 OSI-approved OSS 3k 70 Warning
63 Togather
Open-source community management and event platform.
 63 59 OSI-approved OSS 3 66 Warning
64 Gotify
A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui)
 65 43 OSI-approved OSS 15.1k 65 Warning
65 CBoard
Browser-based AAC communication board with text-to-speech.
 64 42 OSI-approved OSS 738 65 Warning
66 Tiledesk
Install Tiledesk on your server using Helm for Kubernetes orchestration and Docker Compose for running multi-container Docker applications. Tiledesk provides an open-source solution comparable to Voiceflow, empowering you to create sophisticated LLM-enabled chatbots that seamlessly transition interactions to human agents when needed.
 62 42 OSI-approved OSS 301 65 Warning
67 WhippyTerm
Modern Serial Terminal
 63 43 OSI-approved OSS 89 64 Warning
68 Open IM
IM Chat OpenClaw
 72 27 OSI-approved OSS 16.4k 63 Warning
69 HappyDeliver
Open-source email deliverability testing platform.
 60 41 OSI-approved OSS 214 61 Warning
70 Linphone
Linphone is a free VoIP and video softphone based on the SIP protocol. Mirror of git://git.linphone.org/linphone-desktop.git
 64 25 OSI-approved OSS 487 60 Warning
71 LastSignal
A self-hosted dead man's switch for delivering encrypted messages (E2EE) to your loved ones — when you're gone or unresponsive.
 62 31 OSI-approved OSS 650 59 Warning
72 Anon.li
Email aliasing and zero-knowledge encrypted file sharing.
 59 31 OSI-approved OSS 3 59 Warning
73 Chativa
Self-hosted end-to-end encrypted messaging platform for SMEs.
 52 34 License unknown 0 58 Warning
74 Discuit
Open-source community discussion platform.
 69 17 OSI-approved OSS 542 56 Warning
75 Deskive
Open-source workspace collaboration platform with chat, video calls, projects, files, calendar, notes, and AI tools.
 55 35 OSI-approved OSS 22 56 Warning
76 Fonoster
🚀 The open-source alternative to Twilio.
 58 16 OSI-approved OSS 8k 55 Warning
77 Late.fyi
Email-driven train tracker with notifications by email or ntfy.
 49 44 OSI-approved OSS 0 55 Critical
78 LocalSend
An open-source cross-platform alternative to AirDrop
 69 10 OSI-approved OSS 83.2k 54 Warning
79 Mox
modern full-featured open source secure mail server for low-maintenance self-hosted email
 65 14 OSI-approved OSS 5.7k 54 Warning
80 Colanode
Open-source and local-first Slack and Notion alternative that puts you in control of your data
 51 20 OSI-approved OSS 4.9k 54 Warning
81 OpenArchiver
An open-source platform for legally compliant email archiving.
 51 20 OSI-approved OSS 2.1k 52 Warning
82 QuoteVote
Nonprofit open-source platform to post, vote, and deliberate.
 47 35 OSI-approved OSS 31 52 Critical
83 MaiHH-Connect
Address book and network for agents to chat, collaborate, and deliver efficiently.
 59 14 License unknown 0 51 Warning
84 SmartMenu
Open-source multi-tenant platform for building multilingual restaurant menus.
 49 25 License unknown 1 49 Critical
85 Vanilla
A platform for community discussion
 54 7 OSI-approved OSS 3k 48 Warning
86 VoteKit
Open source membership plebiscite platform.
 51 14 License unknown 0 47 Warning
87 OpenCom
A simple Open Source communication Platform
 37 23 OSI-approved OSS 5 47 Critical
88 Mail0
Experience email the way you want with Mail0 – the first open source email app that puts your privacy and safety first. Join the discord: https://mail0.link/discord
 54 0 OSI-approved OSS 10.6k 46 Warning
89 Tinode
General instant messaging
 47 10 OSI-approved OSS 13.4k 45 Critical
90 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.
 46 7 OSI-approved OSS 8.9k 45 Critical
91 Spacebar
📬 Spacebar is a free open source selfhostable discord compatible communication platform
 43 7 OSI-approved OSS 6.7k 45 Critical
92 Weevean
Open-source team collaboration platform with real-time messaging, channels, and DMs.
 49 0 OSI-approved OSS 12 44 Critical
93 Circled
Video calls, chat, photo sharing, and community server platform.
 44 7 OSI-approved OSS 209 41 Critical
94 Wechaty
Conversational RPA SDK for Chatbot Makers. Join our Discord: https://discord.gg/7q8NBZbQzt
 44 0 OSI-approved OSS 22.8k 41 Critical
95 CloudMeet
Open-source Calendly alternative running on Cloudflare's free tier. Meeting scheduler with Google Calendar and Outlook sync.
 41 7 OSI-approved OSS 490 40 Critical
96 Twake
Twake is a secure open source collaboration platform to improve organizational productivity.
 38 0 OSI-approved OSS 1.9k 40 Critical
97 LimeJourney
Open source customer engagement platform for transactional and marketing messages.
 41 0 OSI-approved OSS 130 39 Critical
98 OTRS Community Edition
Open source ticketing system for help desk, customer service, and IT service management.
 38 0 OSI-approved OSS 61 37 Critical
99 Uninbox
Modern email for teams and professionals. A replacement for outdated email technology and tools. Alt to hey.com, front.com, missiveapp.com
 36 0 OSI-approved OSS 1.7k 37 Critical
100 Echokit Server
Open-source voice agent platform.
 30 0 OSI-approved OSS 585 36 Critical
101 Clatter
Open-source chatting platform for workplaces.
 28 0 OSI-approved OSS 8 35 Critical
102 Helpy
Helpy is a modern, open source helpdesk customer support application. Features include knowledgebase, community discussions and support tickets integrated with email.
 36 0 OSI-approved OSS 2.5k 34 Critical
103 Chaskiq
A full featured Live Chat, Support & Marketing platform, alternative to Intercom, Drift, Crisp.
 31 0 OSI-approved OSS 3.5k 34 Critical
104 Kap
An open-source screen recorder built with web technology
 33 0 OSI-approved OSS 19.2k 33 Critical
105 UVDesk
Ticket Management & Helpdesk system
 33 0 OSI-approved OSS 19k 33 Critical
106 Indic Subtitler
Open source subtitling platform for transcribing and translating videos and audio in Indic languages.
 26 0 OSI-approved OSS 93 33 Critical
107 OpenStreamPoll
Open-source live polling platform for streamers.
 26 0 OSI-approved OSS 21 32 Critical
108 Wavelength
Privacy-focused, cross-platform, and open-source C++ & WebSocket based communication application
 24 0 OSI-approved OSS 4 32 Critical
109 GO-FLY LIVE CHAT
Open source self-hosted live chat and customer support software.
 31 0 OSI-approved OSS 2.5k 31 Critical
110 CareSync
Open-source healthcare communication platform for doctors, pharmacists, and patients.
 27 0 OSI-approved OSS 91 31 Critical
111 Linen
Slack alternative for communities with searchable content.
 27 0 OSI-approved OSS 2.8k 31 Critical
112 OpenPaaS
Open PaaS Enterprise Social Network
 23 0 OSI-approved OSS 485 31 Critical
113 AChat
🌊 AChat - An open-source/self-hosted/local-first AI platform, designed for enterprises and teams, perfectly combining powerful local processing capabilities with seamless remote synchronization.
 23 0 License unknown 3.3k 30 Critical
114 ViMbAdmin
Virtual Mailbox Administration
 28 0 OSI-approved OSS 485 29 Critical
115 Pollmodoro
Open-source polling platform built with SvelteKit and Cloudflare Workers.
 23 0 License unknown 3 29 Critical
116 Quorum
Open-source platform for real-time polling, discussion, and visualization.
 23 0 License unknown 1 29 Critical
117 Glimesh
Open-source live streaming platform.
 23 0 OSI-approved OSS 495 28 Critical
118 Input Right
An open-source AI voice agent platform that turns conversations into 100% accurate, user-verified data via a visual form.
 21 0 OSI-approved OSS 37 28 Critical
119 IndiePubStack
Open-source publishing platform for developers.
 21 0 OSI-approved OSS 17 26 Critical

Evidence Watch

Tracked tools with useful public signals but no verdict score yet.

Campsite

Async team communication platform for remote and distributed teams.

54 confidence

Slack

Business communication platform

68 confidence

ThoughtBase

Open-source feedback management platform.

72 confidence

WhatsDesk

Open-source WhatsApp marketing and automation platform.

73 confidence

Zola

Open chat interface for all your models.

73 confidence