Open-Source Rankings

Ordered by GitHub stars first, then ToolVitals score to break ties between similarly adopted projects.

# Tool Health Shipping Stars Score Status
01 LocalSend
An open-source cross-platform alternative to AirDrop
64 0 79.1k 35 Warning
02 Rocket.Chat
The Secure CommsOSβ„’ for mission-critical operations
100 100 45.2k 100 Active
03 Cal.com
Open-source scheduling infrastructure
100 100 42.2k 100 Active
04 Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
100 100 36.4k 100 Active
05 Jitsi Meet
Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.
84 56 29.1k 71 Active
06 Chatwoot
Open-source live-chat, email support, omni-channel desk. An alternative to Intercom, Zendesk, Salesforce Service Cloud etc. πŸ”₯πŸ’¬
97 88 28.9k 93 Active
07 Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
94 72 25.1k 84 Active
08 Wechaty
Conversational RPA SDK for Chatbot Makers. Join our Discord: https://discord.gg/7q8NBZbQzt
52 0 22.7k 29 Warning
09 Kap
An open-source screen recorder built with web technology
39 0 19.2k 21 Critical
10 Cap
Open source Loom alternative. Beautiful, shareable screen recordings.
92 88 18.4k 90 Active
11 Mailspring
:love_letter: A beautiful, fast and fully open source mail client for Mac, Windows and Linux.
92 88 17.4k 90 Active
12 Open IM
IM Chat OpenClaw
62 47 16.3k 55 Warning
13 Gotify
A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui)
81 47 14.9k 66 Warning
14 FreshRSS
A free, self-hostable news aggregator…
70 9 14.9k 43 Warning
15 Lemmy
πŸ€ A decentralised discussion platform for communities.
92 88 14.4k 90 Active
16 Notesnook
A fully open source & end-to-end encrypted note taking alternative to Evernote.
100 100 14k 100 Active
17 Owncast
Take control over your live stream video by running it yourself. Streaming + chat out of the box.
84 56 11.2k 71 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 πŸ“±!
97 80 11k 89 Active
19 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
45 0 10.5k 25 Critical
20 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.
58 0 8.4k 32 Warning
21 Fonoster
πŸš€ The open-source alternative to Twilio.
70 38 7.8k 56 Warning
22 CryptPad
Collaborative office suite, end-to-end encrypted and open-source.
91 72 7.5k 82 Active
23 Spacebar
πŸ“¬ Spacebar is a free open source selfhostable discord compatible communication platform
58 0 6.7k 32 Warning
24 DooTask
Open-source online project task management tool with docs, mind maps, flowcharts, IM, and file management.
85 72 5.5k 79 Active
25 Plunk
The Open-Source Email Platform
95 88 5k 92 Active
26 Colanode
Open-source and local-first Slack and Notion alternative that puts you in control of your data
74 72 4.8k 73 Warning
27 FreeScout
FreeScout β€” Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)
91 100 4.2k 95 Active
28 useSend
Open source alternative to Resend, Sendgrid, Postmark etc.
82 80 4.2k 81 Active
29 Chaskiq
A full featured Live Chat, Support & Marketing platform, alternative to Intercom, Drift, Crisp.
30 0 3.5k 16 Critical
30 Modoboa
Mail hosting made simple
89 88 3.5k 89 Active
31 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
92 100 3.3k 96 Active
32 Kamailio
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms, focusing on flexibility, security and scalability
82 62 2.8k 73 Active
33 Linen
Slack alternative for communities with searchable content.
32 0 2.8k 18 Critical
34 Nexu
Desktop client that bridges agents to chat platforms.
92 100 2.7k 96 Active
35 TextBee
open-source sms-gateway. turn any android phone into an sms gateway
71 47 2.5k 60 Warning
36 Helpy
Helpy is a modern, open source helpdesk customer support application. Features include knowledgebase, community discussions and support tickets integrated with email.
42 0 2.5k 23 Critical
37 LibreDesk
Open source, self-hosted omnichannel customer support desk. Live chat, email, and more in a single binary.
89 88 2.5k 89 Active
38 Meet
Open source video conferencing app powered by LiveKit. Built with Django and React.
89 88 2k 89 Active
39 OpenArchiver
An open-source platform for legally compliant email archiving.
73 47 2k 61 Warning
40 Notifuse
Notifuse is an open-source & modern emailing platform
92 100 1.9k 96 Active
41 Twake
Twake is a secure open source collaboration platform to improve organizational productivity.
55 0 1.9k 30 Warning
42 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.
89 88 1.9k 89 Active
43 Uninbox
Modern email for teams and professionals. A replacement for outdated email technology and tools. Alt to hey.com, front.com, missiveapp.com
52 0 1.7k 29 Warning
44 Pontoon
Mozilla's Localization Platform
73 0 1.6k 40 Warning
45 Mezon
Mezon is a new way to communicate with your team. It's faster, better organized, better for WFH.
85 72 1.5k 79 Active
46 AgentNetworkProtocol
AgentNetworkProtocol(ANP) is an open source protocol for agent communication. Our vision is to define how agents connect with each other, building an open, secure, and efficient collaboration network for billions of intelligent agents.
73 0 1.3k 40 Warning
47 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.
90 100 1.1k 94 Active
48 Keeper
Calendar sync tool & universal calendar MCP server. Aggregate, sync and control calendars on Google, Outlook, Office 365, iCloud, CalDAV or ICS.
79 100 1k 88 Active
49 Castopod
Castopod is an open-source hosting platform made for podcasters who want engage and interact with their audience. Synchronized read-only mirror of https://code.castopod.org/adaures/castopod
48 0 847 26 Critical
50 CBoard
Browser-based AAC communication board with text-to-speech.
73 38 733 57 Warning
51 Cossistant
Open-source, customer support platform with fully customizable AI support agents for developers / startups shipping SaaS.
84 100 645 91 Active
52 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.
70 0 555 38 Warning
53 Ethora
Open-source engine for chat πŸ’¬, AI assistants πŸ€– & wallets πŸͺͺ. React, Typescript, Python, XMPP. Build future apps with chat, AI agents and web3.
78 56 529 68 Active
54 LastSignal
A self-hosted dead man's switch for delivering encrypted messages (E2EE) to your loved ones β€” when you're gone or unresponsive.
68 0 500 37 Warning
55 OpenPaaS
Open PaaS Enterprise Social Network
33 0 485 18 Critical
56 ViMbAdmin
Virtual Mailbox Administration
33 0 485 18 Critical
57 Linphone
Linphone is a free VoIP and video softphone based on the SIP protocol. Mirror of git://git.linphone.org/linphone-desktop.git
70 0 479 38 Warning
58 CloudMeet
Open-source Calendly alternative running on Cloudflare's free tier. Meeting scheduler with Google Calendar and Outlook sync.
45 0 474 25 Critical
59 KumoMTA
The first Open-Source high-performance MTA developed from the ground-up for high-volume email sending environments.
78 56 472 68 Active
60 PlugNmeet
The open-source, self-hosted video conferencing software. Scalable, customizable, and with a powerful AI Meeting Agent.
86 88 452 87 Active
61 Haven Chat
Self-hosted private chat β€” No cloud, no telemetry, no Big Tech. Discord alternative that runs on your own machine.
94 100 376 97 Active
62 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.
72 72 288 72 Warning
63 Circled
Video calls, chat, photo sharing, and community server platform.
70 0 209 38 Warning
64 Wire
πŸ“± Wire for iOS (iPhone and iPad)
87 55 131 73 Active
65 Quackback
Open source alternative to Canny, UserVoice, Productboard
86 100 61 92 Active
66 Gryt
Monorepo for the Gryt voice chat platform β€” a self-hostable, WebRTC-based voice communication app with a desktop client, signaling server, SFU, and Keycloak auth.
77 100 36 87 Active
67 Input Right
An open-source AI voice agent platform that turns conversations into 100% accurate, user-verified data via a visual form.
30 0 34 16 Critical

Commercial Rankings

Kept separate so commercial tools are ranked on ToolVitals public-product signals without GitHub-star bias.

# Tool Health Shipping Score Status
01 Discord
Voice and text chat for communities
98 95 97 Active
02 Slack
Business communication platform
91 73 86 Active

Evidence Watch

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