Best Open Source Communication Projects

Session

An end-to-end encrypted messenger that minimizes sensitive metadata.

Web interface for managing Postfix mail servers

Sup

Console email client for people with a lot of email

Hawkpost

Let people send you encrypted messages without knowing PGP

Cabal Desktop

P2P community chat platform

Speek

A decentralized, serverless, and completely anonymous chat.

Kontalk

Community-powered encrypted messaging

Customizable web chat in JavaScript and PHP

Constable

Phoenix app for company announcements and discussions

Snikket

A simple, secure messaging platform for friends and family.

Schildichat

A Matrix client based on Element with a more traditional messenger experience.

Lightweight webmail front end for IMAP servers

Mutt

Small, fast, text-based email client for the terminal

Friendly, full-featured text-mode email and news client

Free chat platform with threads, upvotes and RSS bots

Simple, ethical, and open-source email hosting.

The most secure collaboration platform.