Best Open Source Encrypted Communication Tools using Prettier in 2026

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,295
Forks
8,543
Last commit
2 hours ago

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

Element

Secure, decentralized messaging for teams and individuals

Stars
13,004
Forks
2,568
Last commit
8 hours ago

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

Open Source Alternative to:

Discord

Fluxer

Open source messaging with privacy and community focus

Stars
8,318
Forks
468
Last commit
12 days ago

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

Tuta

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

Stars
7,486
Forks
611
Last commit
16 hours ago

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
3,571
Forks
506
Last commit
7 hours ago

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

Open Source Alternative to:

Discord

SAMA

Secure, scalable chat server for modern applications

Stars
152
Forks
11
Last commit
4 days ago

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

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Stars
Forks
Last commit

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,295
Forks
8,543
Last commit
2 hours ago

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

Element

Secure, decentralized messaging for teams and individuals

Stars
13,004
Forks
2,568
Last commit
8 hours ago

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

Open Source Alternative to:

Discord

Fluxer

Open source messaging with privacy and community focus

Stars
8,318
Forks
468
Last commit
12 days ago

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

Tuta

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

Stars
7,486
Forks
611
Last commit
16 hours ago

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
3,571
Forks
506
Last commit
7 hours ago

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

Open Source Alternative to:

Discord

SAMA

Secure, scalable chat server for modern applications

Stars
152
Forks
11
Last commit
4 days ago

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

Open Source Encrypted Communication Tools using Prettier

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