ToolVitals
💬

Communication

Chat, video conferencing, async communication

156 tools across 13 use cases

Team Chat

Team messaging, communities, and async communication tools.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
MattermostTop Pick
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
OSI-approved OSS
39k starsActive97
02
Element
Enterprise communication platform
OSI-approved OSS
13.4k starsActive97
03
Rocket.Chat
The Secure CommsOS™ for mission-critical operations
OSI-approved OSS
46.1k starsActive97

14 tools are not scored because comparable open/source-visible evidence is unavailable.

Transactional Messaging

SMS, email, push, and transactional notification APIs.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
OpenWATop Pick
Self-hosted WhatsApp API gateway.
OSI-approved OSS
14k starsActive98
02
Plunk
The Open-Source Email Platform
OSI-approved OSS
5.5k starsActive95
03
Nodemailer
✉️ Send e-mails with Node.JS – easy as cake!
OSI-approved OSS
17.7k starsActive94

1 tool is on Evidence Watch.

4 tools are not scored because comparable open/source-visible evidence is unavailable.

Email Clients & Webmail

Email clients and webmail interfaces for reading, organizing, and sending email across one or more inboxes.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
thunderbird-androidTop Pick
Thunderbird for Android – Open Source Email App for Android (fka K-9 Mail)
OSI-approved OSS
14k starsActive98
02
Inbox Zero
The world's best AI personal assistant for email. Open source app to help you reach inbox zero fast.
OSI-approved OSS
12.2k starsActive97
03
Bulwark Mail
Self-hosted JMAP webmail client for modern mail servers.
OSI-approved OSS
1.1k starsActive97

1 tool is not scored because comparable open/source-visible evidence is unavailable.

Video Conferencing

Video meetings, conferencing, webinars, and calling tools.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
MeetTop Pick
Open source video conferencing app powered by LiveKit. Built with Django and React.
OSI-approved OSS
2.4k starsActive97
02
Jitsi Meet
Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application.
OSI-approved OSS
29.9k starsActive96
03
LiveKit
SFU and SDKs for high-performance, scalable WebRTC
OSI-approved OSS
20.8k starsActive96

1 tool is not scored because comparable open/source-visible evidence is unavailable.

Telephony & PBX

Phone system software for SIP/VoIP calling, call routing, voicemail, and PBX operations.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
KamailioTop Pick
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms, focusing on flexibility, security and scalability
OSI-approved OSS
2.9k starsActive97
02
dograh
Open-source voice agent platform.
OSI-approved OSS
5.6k starsActive96
03
FS PBX
Open-source PBX platform for business telephony and VoIP deployments.
OSI-approved OSS
230 starsActive95

2 tools are not scored because comparable open/source-visible evidence is unavailable.

Self-Hosted Email Server

Self-hosted mail server stacks for deploying and managing SMTP, IMAP, webmail, DNS, and related email infrastructure.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
gromoxTop Pick
Groupware backend supporting mail and calendar protocols.
OSI-approved OSS
253 starsActive96
02
Modoboa
Mail hosting made simple
OSI-approved OSS
3.5k starsActive94
03
Mox
modern full-featured open source secure mail server for low-maintenance self-hosted email
OSI-approved OSS
5.9k starsActive91

1 tool is not scored because comparable open/source-visible evidence is unavailable.

Booking & Reservations

Tools for booking shared spaces, resources, rentals, or appointments and managing reservations, availability, and rental workflows.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
TymeSlotTop Pick
Open-source meeting scheduling platform.
OSI-approved OSS
190 starsActive95
02
Cal.com
Open-source scheduling infrastructure
Open core
48.3k starsActive79
03
CloudMeet
Open-source Calendly alternative running on Cloudflare's free tier. Meeting scheduler with Google Calendar and Outlook sync.
OSI-approved OSS
524 starsCritical22

1 tool is not scored because comparable open/source-visible evidence is unavailable.

Event Management

Tools for planning and running events, conferences, hackathons, registration, ticketing, CFPs, scheduling, and speaker workflows.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
HitobitoTop Pick
Web app for managing complex group hierarchies, members, events, and more.
OSI-approved OSS
477 starsActive95
02
tickets
Minimalist and private ticket sales platform.
OSI-approved OSS
31 starsActive94
03
Togather
Open-source community management and event platform.
OSI-approved OSS
7 starsActive83

1 tool is not scored because comparable open/source-visible evidence is unavailable.

Email Aliasing & Forwarding

Tools for creating email aliases, masks, and forwarding addresses to protect privacy and route mail to real inboxes.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
MailXTop Pick
Audited open-source email aliasing service.
OSI-approved OSS
65 starsActive94
02
Anon.li
Email aliasing and zero-knowledge encrypted file sharing.
OSI-approved OSS
8 starsWarning70
03
AnonAddy
Anonymous email forwarding service.
OSI-approved OSS
4.8k starsWarning65

File Storage & Sharing

Tools for storing, organizing, syncing, and securely sharing files across users or teams.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
LocalSendTop Pick
An open-source cross-platform alternative to AirDrop
OSI-approved OSS
90.5k starsActive95

2 tools are not scored because comparable open/source-visible evidence is unavailable.

Email Aliasing & Forwarding

Tools for creating email aliases, masks, and forwarding addresses to protect privacy and route mail to real inboxes.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
SimpleLoginTop Pick
The SimpleLogin back-end and web app
OSI-approved OSS
7k starsActive84

Learning Management Systems

Platforms for hosting, delivering, and managing online courses, learners, instructors, and course content.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
OpenCircleTop Pick
Open-source social learning platform combining online education with community interaction.
OSI-approved OSS
109 starsCritical7

Temporary Email

Services for creating disposable inboxes and temporary email addresses.

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Open/source-visible picks

Health-first ToolVitals score, then adoption

01
MoEmailTop Pick
Temporary email service.
OSI-approved OSS
2.8k starsWarning63