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Open Source Data Security & Privacy Tools

A curated collection of the best open source tools focused on protecting data and ensuring user privacy..

See also:Encrypted StorageEncrypted Communication

Puter

A full desktop environment that runs in your browser

  • Stars

    44,095

  • Last commit

    8 hours ago

  • License

    AGPL-3.0
Puter is a cloud-based desktop OS you run in the browser, with built-in apps, file storage, and support for hosting web apps and sites.

Open Source Alternative to:

Google Drive

Mattermost

Secure collaboration platform for mission-critical work

  • Stars

    39,532

  • Last commit

    8 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

Ente

Secure, private photo storage and sharing solution

  • Stars

    29,902

  • Last commit

    8 hours ago

  • License

    AGPL-3.0
End-to-end encrypted cloud storage for photos and videos, offering privacy, security, and seamless cross-device syncing.

Open Source Alternative to:

Google Drive

Signal

Private messaging with end-to-end encryption

  • Stars

    29,580

  • Last commit

    18 hours 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

Cryptomator

Client-side encryption for your cloud files

  • Stars

    16,453

  • Last commit

    9 hours ago

  • License

    GPL-3.0
Encrypts files and filenames locally before they reach Dropbox, Google Drive, OneDrive, or any other cloud, so only you hold the key.

Open Source Alternative to:

pCloud Encryption

Fluxer

Open source messaging with privacy and community focus

  • Stars

    10,776

  • Last commit

    11 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

    13,642

  • Last commit

    20 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

    8,118

  • Last commit

    8 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

    3,970

  • Last commit

    1 day 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

    3,447

  • 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

    2,660

  • Last commit

    3 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

Peergos

Secure, private, and decentralized file storage

  • Stars

    2,549

  • Last commit

    1 day ago

  • License

    AGPL-3.0
A peer-to-peer encrypted filesystem for secure file storage, sharing, and collaboration with end-to-end encryption and user-controlled data.

Open Source Alternative to:

Dropbox

Wire

Secure collaboration platform with end-to-end encryption

  • Stars

    2,555

  • 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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