Communication

Chat, email, video calls and social networks you run yourself

Chat & Messaging 63 Video Conferencing 12 VoIP & Telephony 11 Email Servers & Webmail 34 Newsletters & Mailing Lists 8 Social Networks & Forums 45 Push Notifications 4 Privacy Frontends 17

All apps in Communication

# App Description Stars Language Updated
1 mastodon/mastodon Your self-hosted, globally interconnected microblogging community 50,595 Ruby today
2 discourse/discourse A platform for community discussion. Free, open, simple. 48,074 Ruby today
3 novuhq/novu The open-source communication infrastructure for agents and products 40,325 TypeScript today
4 mattermost/mattermost Mattermost is an open source platform for secure collaboration across the entire software development lifecycle.. 39,584 TypeScript today
5 binwiederhier/ntfy Send push notifications to your phone or desktop using PUT/POST 35,489 Go today
6 jitsi/jitsi-meet Jitsi Meet - Secure, Simple and Scalable Video Conferences that you use as a standalone app or embed in your web application. 30,219 TypeScript today
7 zulip/zulip Zulip server and web application. Open-source team chat that helps teams stay productive and focused. 26,211 Python today
8 knadh/listmonk High performance, self-hosted, newsletter and mailing list manager with a modern dashboard. Single binary app. 24,257 Go today
9 docker-mailserver/docker-mailserver Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. 19,738 Shell today
10 simplex-chat/simplex-chat SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱! 19,683 Haskell today
11 caronc/apprise Apprise - Push Notifications that work with just about every platform! 17,752 Python today
12 postalserver/postal 📮 A fully featured open source mail delivery platform for incoming & outgoing e-mail 16,950 Ruby today
13 flarum/flarum Simple forum software for building great communities. 16,442 PHP 5d
14 mailhog/MailHog Web and API based SMTP testing 16,205 Go 2y
15 gotify/server A simple server for sending and receiving messages in real-time per WebSocket. (Includes a sleek web-ui) 16,199 Go 2d
16 stalwartlabs/stalwart All-in-one Mail & Collaboration server. Secure, scalable and fluent in every protocol (IMAP, JMAP, SMTP, CalDAV, CardDAV, WebDAV). 15,861 Rust 1d
17 apache/answer A Q&A platform software for teams at any scales. Whether it's a community forum, help center, or knowledge management platform, you can always count on Apache … 15,713 Go today
18 mail-in-a-box/mailinabox Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box. 15,463 Python 3d
19 NodeBB/NodeBB Node.js based forum software built for the modern web 15,247 JavaScript today
20 LemmyNet/lemmy 🐀 A decentralised discussion platform for communities. 14,676 Rust 1d
21 zedeus/nitter archived Alternative Twitter front-end 14,456 Nim 1mo
22 mailcow/mailcow-dockerized mailcow: dockerized - 🐮 + 🐋 = 💕 13,779 PHP 1d
23 diaspora/diaspora A privacy-aware, distributed, open source social network. 13,654 Ruby 3mo
24 element-hq/element-web A glossy Matrix collaboration client for the web. 13,653 TypeScript today
25 tinode/chat Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots 13,565 Go 17d
26 matrix-org/synapse archived Synapse: Matrix homeserver written in Python/Twisted. 12,090 Python 2y
27 benbusby/whoogle-search archived A self-hosted, ad-free, privacy-respecting metasearch engine 11,554 Python 2mo
28 misskey-dev/misskey 🌎 A completely free and open interplanetary-microblogging platform 🚀 11,381 TypeScript today
29 mautic/mautic Mautic: Open Source Marketing Automation Software. 10,970 PHP today
30 centrifugal/centrifugo Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up onc… 10,963 Go today
31 screego/server screen sharing for developers https://screego.net/ 10,752 Go 17d
32 TeamPiped/Piped An alternative privacy-friendly YouTube frontend which is efficient by design. 10,324 Vue today
33 sdelements/lets-chat archived Self-hosted chat app for small teams 9,789 JavaScript 12mo
34 bigbluebutton/bigbluebutton A complete web conferencing system for virtual classes and more! 9,274 TypeScript today
35 meetecho/janus-gateway Janus WebRTC Server 9,205 C 1d
36 mailpile/Mailpile A free & open modern, fast email client with user-friendly encryption and privacy features 8,807 Python 3y
37 mumble-voip/mumble Mumble is an open-source, low-latency, high quality voice chat software. 8,414 C++ today
38 Mailu/Mailu Insular email distribution - mail server as Docker images 7,614 Python 1d
39 roundcube/roundcubemail The Roundcube Webmail suite 7,270 PHP today
40 pixelfed/pixelfed Photo Sharing. For Everyone. 7,142 PHP today
41 simple-login/app The SimpleLogin back-end and web app 7,135 Python 1d
42 sj26/mailcatcher Catches mail and serves it through a dream. 6,785 Ruby 1d
43 humhub/humhub HumHub is an Open Source Enterprise Social Network. Easy to install, intuitive to use and extendable with countless freely available modules. 6,783 PHP today
44 processone/ejabberd Robust, Ubiquitous and Massively Scalable Messaging Platform (XMPP, MQTT, SIP Server) 6,750 Erlang 1d
45 thelounge/thelounge 💬 ‎ Modern, responsive, cross-platform, self-hosted web IRC client 6,372 TypeScript today
46 foxcpp/maddy ✉️ Composable all-in-one mail server. 6,128 Go today
47 Mailtrain-org/mailtrain Self hosted newsletter app 5,754 JavaScript 1y
48 umputun/remark42 comment engine 5,648 Go 1d
49 soketi/soketi Next-gen, Pusher-compatible, open-source WebSockets server. Simple, fast, and resilient. 📣 5,636 TypeScript 1y
50 haraka/Haraka A fast, highly extensible, and event driven SMTP server 5,635 JavaScript 5d