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Pick a category to scan the registry. A green check on a card means the maintainer published that manifest themselves at their own domain. For natural-language search, use /find .
Showing 121–180 of 530 (10490 total) · Search by description →
Team Chat & Messaging
RetroShare
Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.
Team Chat & Messaging
Ripcord
Desktop chat client for Slack (and Discord)
Email Infrastructure
SendGrid
Cloud-based service for sending transactional and marketing emails.
Team Chat & Messaging
Stream
Provides APIs and SDKs for building activity feeds, chat, and video streaming in apps.
Email Clients
Tuta Mail
Email client
Email Infrastructure
wildduck
Scalable no-SPOF IMAP/POP3 mail server.
Team Chat & Messaging
Legcord
Custom Discord client
Team Chat & Messaging
Prosody IM
Feature-rich and easy to configure XMPP server.
Video & Voice
Roam
Virtual office
Video & Voice
Textream
Free teleprompter with real-time word tracking and voice-activated scrolling.
AI Chat & Voice Agents
AgentCall
Phone Numbers for AI Agents
Team Chat & Messaging
BetterDiscord
Installer for BetterDiscord
Team Chat & Messaging
Cabal
Desktop client for the chat platform Cabal
Email Infrastructure
chasquid
SMTP (email) server with a focus on simplicity, security, and ease of operation.
Team Chat & Messaging
Conduit
A simple, fast, and reliable chat server powered by Matrix.
Email Clients
Cypht
Feed reader for your email accounts.
Video & Voice
FreeSWITCH
Scalable open source cross-platform telephony platform.
Video & Voice
Galene
Video conferencing server that is easy to deploy and that requires moderate server resources.
Email Infrastructure
Haraka
Fast, highly extensible, and event driven SMTP server.
Email Infrastructure
iRedMail
Full-featured mail server solution based on Postfix and Dovecot.
Video & Voice
Jitsi
Open-source video calls and chat
Video & Voice
MiroTalk C2C
Real-time cam-2-cam video calls & screen sharing, end-to-end encrypted, to embed in any website with a simple iframe.
Forums & Community
Misago
Fully featured modern forum application that is fast, scalable and responsive.
Video & Voice
Mumble
Low-latency, high quality voice/text chat software.
Forums & Community
NodeBB
Forum software built for the modern web.
Team Chat & Messaging
Openfire
Real time collaboration (RTC) server.
Video & Voice
PortalBox
Share a region of your screen in video calls
Email Infrastructure
Postfix
Fast, easy to administer, and secure Sendmail replacement.
Email Infrastructure
Postmark
Transactional email service for sending and tracking application-generated emails.
Forums & Community
Scoold
Stack Overflow in a JAR. An enterprise-ready Q&A platform with full-text search, SAML, LDAP integration and social login support.
Email Infrastructure
Sendy
Self-hosted email newsletter application that lets you send bulk emails via Amazon Simple Email Service (SES) or other SMTP services.
Video & Voice
SIPCAPTURE Homer
Troubleshooting and monitoring VoIP calls.
Forums & Community
Talkyard
Create a community, where your users can suggest ideas and get questions answered. And have friendly open-ended discussions and chat…
Team Chat & Messaging
Threema
End-to-end encrypted instant messaging application
Customer Support & Live Chat
Zammad
Easy to use but powerful open-source support and ticketing system.
Team Chat & Messaging
Zulip
Desktop client for the Zulip team chat platform
Team Chat & Messaging
accord
Discord client written in Swift for modern Macs
Customer Support & Live Chat
Crisp
Crisp provides live chat, inbox, and chatbot tools for website visitor communication.
Email Clients
Gmail
Google's email service for sending, receiving, and organizing messages.
AI Chat & Voice Agents
Google Translate
Provides instant text and speech translation between many languages.
AI Chat & Voice Agents
Grok
AI-powered chatbot integrated into X for conversational queries and tasks.
Team Chat & Messaging
Libervia
Web frontend from Salut à Toi.
Email Infrastructure
Mautic
Marketing automation software (email, social and more).
Team Chat & Messaging
MongooseIM
Mobile messaging platform with a focus on performance and scalability.
Email Clients
Mozilla Thunderbird
Customizable email client
Email Clients
PrivMX WebMail
Alternative private mail system - web-based, end-to-end encrypted by design, self-hosted, decentralized, uses independent PKI. Easy to…
Video & Voice
SIP3
VoIP troubleshooting and monitoring platform.
Team Chat & Messaging
Slack
Team messaging and collaboration platform.
AI Chat & Voice Agents
Spokenly
Voice-to-text with 100+ languages, offline mode, and AI-powered formatting.
Email Infrastructure
Syncloud
Your own online file storage, social network or email server.
Email Clients
ThunderBird
Software that makes email easier. ![Freeware][Freeware Icon]
Team Chat & Messaging
Chatterino
Chat client for https://twitch.tv
Email Infrastructure
Cyrus IMAP
Email (IMAP/POP3), contacts and calendar server.
Team Chat & Messaging
Ergo
Modern IRCv3 server written in Go, combining the features of an ircd, a services framework, and a bouncer.
Email Infrastructure
Exim
Message transfer agent (MTA) developed at the University of Cambridge.
Video & Voice
Flexisip
Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device…
Team Chat & Messaging
InspIRCd
Modular IRC server written in C++ for Linux, BSD, Windows, and macOS.
Email Clients
Mailspring
A beautiful, fast, and fully open source mail client.
Team Chat & Messaging
Monal
XMPP chat client
Email Infrastructure
Moosend
Email marketing automation platform for creating, sending, and tracking campaigns.