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Open Source Encrypted Communication Tools

A curated collection of the best open source communication tools that use end-to-end encryption..

Mattermost

Secure collaboration platform for mission-critical work

  • Stars

    39,577

  • Last commit

    5 hours ago

  • License

    Unknown
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Open Source Alternative to:

Microsoft Teams

Signal

Private messaging with end-to-end encryption

  • Stars

    29,606

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Secure messaging app with state-of-the-art encryption, voice/video calls, group chats, and file sharing. No ads, trackers, or data collection.

Open Source Alternative to:

WhatsApp

Fluxer

Open source messaging with privacy and community focus

  • Stars

    10,844

  • Last commit

    9 hours ago

  • License

    AGPL-3.0
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.

Open Source Alternative to:

Discord

Element

Secure, decentralized messaging for teams and individuals

  • Stars

    13,653

  • Last commit

    6 hours ago

  • License

    AGPL-3.0
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Open Source Alternative to:

Discord

Tuta

Secure email, calendar and contacts with end-to-end encryption

  • Stars

    8,150

  • Last commit

    6 hours ago

  • License

    GPL-3.0
Tuta offers encrypted email, calendar and contacts with quantum-resistant security, protecting your privacy without ads or tracking.

Open Source Alternative to:

Gmail

Cinny

Secure and elegant Matrix client for seamless conversations

  • Stars

    3,978

  • Last commit

    2 days ago

  • License

    AGPL-3.0
Cinny offers a simple, elegant, and secure interface for Matrix-based conversations, protected by end-to-end encryption.

Open Source Alternative to:

Discord

Stoat

Group chat for friends and communities, without the baggage

  • Stars

    3,464

  • Last commit

    14 hours ago

  • License

    Unknown
Self-hostable group chat with servers, channels, voice, and moderation tools. No ads, no data mining, built under EU privacy law.

Open Source Alternative to:

Discord

Quiet

Serverless team chat over Tor, no phone number needed

  • Stars

    2,663

  • Last commit

    9 days ago

  • License

    GPL-3.0
Quiet is a peer-to-peer messaging app that syncs messages directly between devices over Tor, with no central server, no phone number required, and no metadata leaks.

Open Source Alternative to:

Discord

Wire

Secure collaboration platform with end-to-end encryption

  • Stars

    2,556

  • Last commit

    10 months ago

  • License

    GPL-3.0
A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.

Open Source Alternative to:

Discord

SAMA

Secure, scalable chat server for modern applications

  • Stars

    161

  • Last commit

    1 month ago

  • License

    GPL-3.0
Open source chat server with end-to-end encryption, clustering support, and comprehensive messaging features for building real-time communication apps

Open Source Alternative to:

Discord
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