Best Open Source Encrypted Communication Tools using AWS S3 in 2026

Mattermost

Secure collaboration platform for mission-critical work

Stars
36,224
Forks
8,531
Last commit
6 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

Fluxer

Open source messaging with privacy and community focus

Stars
8,259
Forks
462
Last commit
8 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

Stoat

Privacy-first chat app with customizable interface

Stars
2,958
Forks
342
Last commit
12 hours ago

Modern chat platform featuring text channels, community building tools, fine-grained permissions, and complete privacy protection. Open-source and ad-free.

Open Source Alternative to:

Discord

SAMA

Secure, scalable chat server for modern applications

Stars
152
Forks
11
Last commit
2 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
36,224
Forks
8,531
Last commit
6 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

Fluxer

Open source messaging with privacy and community focus

Stars
8,259
Forks
462
Last commit
8 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

Stoat

Privacy-first chat app with customizable interface

Stars
2,958
Forks
342
Last commit
12 hours ago

Modern chat platform featuring text channels, community building tools, fine-grained permissions, and complete privacy protection. Open-source and ad-free.

Open Source Alternative to:

Discord

SAMA

Secure, scalable chat server for modern applications

Stars
152
Forks
11
Last commit
2 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 AWS S3

A curated collection of the best open source communication tools that use end-to-end encryption. using AWS S3.