Best open source communication and social apps

Team chat, email, video calls, forums and decentralized social networks.

Mastodon50.5k

mastodon/mastodon

Self-hosted social network software that joins a federated, decentralized microblogging network.

Alternative to: Twitter, X

LicenseOpen sourceAGPL-3.0

CategorySelf-hosted

LanguageRuby

Last updatetoday

PlatformsWebDocker

Discourse48k

discourse/discourse

Modern open source forum software built for community discussion and long-form conversation.

Alternative to: Reddit

LicenseOpen sourceGPL-2.0

CategorySelf-hosted

LanguageRuby

Last updatetoday

PlatformsWebDocker

Rocket.Chat46.4k

RocketChat/Rocket.Chat

Self-hosted secure team communication platform with chat, video calls and omnichannel customer support.

Alternative to: Slack

LicenseOpen source

CategorySelf-hosted

LanguageTypeScript

Last updatetoday

PlatformsWebDocker

Postiz41k

gitroomhq/postiz-app

AI-powered social media scheduling tool that plans posts across many platforms.

Alternative to: Buffer, Hootsuite

LicenseOpen sourceAGPL-3.0

CategorySelf-hosted

LanguageTypeScript

Last updatetoday

PlatformsWebDocker

Mattermost39.5k

mattermost/mattermost

Open source platform for secure team messaging and collaboration that you can run on your own server.

Alternative to: Slack

LicenseOpen source

CategorySelf-hosted

LanguageTypeScript

Last updatetoday

PlatformsWebDocker

Chatwoot38.9k

chatwoot/chatwoot

Open source live chat and omnichannel support desk, an Intercom alternative.

Alternative to: Intercom

LicenseOpen source

CategorySelf-hosted

LanguageRuby

Last updatetoday

PlatformsWebDocker

bitchat37.1k

permissionlesstech/bitchat

Bluetooth mesh chat app that lets nearby devices message each other without internet.

Alternative to: WhatsApp

LicenseOpen sourceUnlicense

LanguageSwift

Last update4 days ago

PlatformsMaciPhone

ntfy35.3k

binwiederhier/ntfy

Sends push notifications to your phone or desktop with a simple HTTP PUT or POST.

Alternative to: Pushover

LicenseOpen sourceApache-2.0

CategorySelf-hosted

LanguageGo

Last update1 days ago

PlatformsWebAndroidiPhoneDockerCommand line

Telegram Desktop33.5k

telegramdesktop/tdesktop

Official Telegram desktop messaging app for Windows, macOS and Linux computers.

Alternative to: WhatsApp

LicenseOpen sourceGPL-3.0

LanguageC++

Last updatetoday

PlatformsWindowsMacLinux

Telegram for Android30.2k

DrKLO/Telegram

Official Telegram messenger for Android, with its source code published for review.

Alternative to: WhatsApp

LicenseOpen sourceGPL-2.0

LanguageJava

Last update11 days ago

PlatformsAndroid

#11

Jitsi Meet30.2k

Secure, scalable video conferencing you can self-host or use as a standalone app.

Self-hostedWebAndroidiPhoneDocker

#12

Signal Android29.6k

Private messenger for Android with end-to-end encrypted chats, calls and group messaging; the official Signal client.

Android

#13

Hey.xyz29.3k

Decentralized, permissionless social media app built on Lens.

Web

#14

Zulip26.2k

Open source team chat with topic-based threading, an alternative to Slack.

Self-hostedWebAndroidiPhoneDocker

#15

listmonk24.2k

Self-hosted newsletter and mailing list manager that ships as a single binary.

Self-hostedWebDocker

#16

Forem22.8k

Software for running your own community and blogging platform.

Self-hostedWebDocker

#17

LiveKit22.1k

Open source realtime WebRTC server for connecting people and AI.

Self-hostedDocker

#18

SimpleX Chat19.6k

Private messaging network that operates without any user identifiers.

Self-hostedWindowsMacLinuxAndroidiPhone

#19

Bluesky18.4k

Source code of the Bluesky Social client for web, iOS and Android, built with React Native.

WebAndroidiPhone

#20

Mailspring18k

Beautiful, fast open source mail client for Mac, Windows and Linux.

WindowsMacLinux

#21

Postal16.9k

Fully featured platform for sending and receiving email at scale.

Self-hostedLinuxDocker

#22

OpenIM16.8k

Self-hostable open-source server that adds instant messaging and group chat to your own apps.

Self-hostedLinuxDocker

#23

Signal Desktop16.6k

Desktop version of the end-to-end encrypted Signal messenger for Windows, macOS and Linux.

WindowsMacLinux

#24

OpenWA16.6k

Free self-hosted WhatsApp API gateway for sending and receiving messages from your own applications.

Self-hostedDocker

#25

Flarum16.4k

Simple, extensible forum software for communities, customized through a large extension catalog.

Self-hostedWeb

#26

BillionMail16.2k

Open-source mail server, newsletter and email marketing platform.

Self-hostedLinuxDocker

#27

Gotify16.2k

Simple server for sending and receiving push notifications in real time.

Self-hostedWebDocker

#28

Stalwart15.7k

All-in-one mail and collaboration server that speaks IMAP, JMAP, SMTP and other protocols.

Self-hostedLinuxDocker

#29

Apache Answer15.7k

Q&A platform software for teams, usable as a community forum or a help center.

Self-hostedWebDocker

#30

Mail-in-a-Box15.5k

Easy-to-deploy mail server for taking back control of your email.

Self-hostedLinux

#31

Cloud Mail15.4k

All-in-one email service that runs on Cloudflare and handles mail for your own domain.

Self-hostedWeb

#32

NodeBB15.2k

Node.js forum software for the modern web, with real-time notifications and plugins.

Self-hostedWeb

#33

Lemmy14.7k

Decentralised link aggregator and discussion platform for communities, federated through ActivityPub.

Self-hostedWebDocker

#34

Vencord14.4k

Discord client modification with a large plugin catalog for customizing the app.

WindowsMacLinux

#35

Thunderbird for Android14.2k

Open-source Thunderbird email app for Android, formerly known as K-9 Mail

Android

#36

mailcow13.7k

Dockerized full-featured mail server suite with spam and virus protection

Self-hostedDocker

#37

Diaspora13.7k

Privacy-aware open-source social network that runs on a network of independently hosted pods.

Self-hostedWebDocker

#38

Element Web13.6k

Glossy web client for the Matrix network for chat and collaboration

Self-hostedWebDocker

#39

Tinode13.6k

Instant messaging platform with a Go backend and web, Android and iOS clients

Self-hostedWebAndroidiPhoneDocker

#40

Inbox Zero12.9k

Open-source AI email assistant that helps you reach inbox zero

Self-hostedWebDocker

#41

DiscordChatExporter12.3k

Tool that exports Discord chat logs to HTML, JSON or CSV files, with a GUI and a CLI

WindowsDockerCommand line

#42

Signal for iOS12.3k

Source code of the Signal private messenger app for iPhone, with end to end encrypted chats and calls

iPhone

#43

Cloudflare Temp Email12.1k

Free temporary email service on Cloudflare with send and receive support

Self-hostedWeb

#44

Misskey11.4k

Open source, self-hostable microblogging platform compatible with the Fediverse and ActivityPub

Self-hostedWebDocker

#45

Centrifugo10.9k

Scalable self-hosted real-time messaging server for WebSocket and other client connections

Self-hostedLinuxDocker

#46

Mail010.9k

Open source email client you can shape to your own workflow.

Self-hostedWebDocker

#47

Fluxer10.8k

Free, open source instant messaging and voice chat app for communities and friends

Self-hostedWindowsMacLinuxWebAndroidiPhone

#48

RTranslator10.6k

Android app for real-time translation that runs locally, without needing an internet connection

Android

#49

NetNewsWire10.5k

Free, open source RSS and Atom reader for macOS and iOS with iCloud sync

MaciPhone

#50

Evolution API10k

Open source API server for WhatsApp integration, to send and receive messages programmatically

Self-hostedWebDocker

No tools match these filters.