messaging

Telegram is a cloud-based mobile and desktop messaging app with a focus on security and speed.

Signal is an encrypted communications application.

A feature-rich desktop native client developed for Windows, MacOS, and Linux platforms, allowing you to enjoy the instant messaging service on your PC.

Graphical client for the Soulseek peer-to-peer network

SimpleX - the first messaging network operating without user identifiers of any kind - 100% private by design! iOS, Android and desktop apps 📱!

End-to-end encryption for things that matter. Keybase is secure messaging and file-sharing.

A decentralized and secure messenger app

Command-line interface for Slack Web API

Command-line interface for Slack Web API

Unofficial UWP Instagram Direct Message client for Windows

FOSS messaging and emailing app that combines common web applications into one

Self hosted local network messaging system

ttth (talk to the hand) is an electron based desktop app for online services like WhatsApp, Threema, Telegram, Twitter, Google and several others.

Secure Exchanges OASF client for Windows.

Kahla is a cross-platform business messaging app.

Brosix is an Instant Messaging Software for Businesses, providing encrypted, real-time communications, across multiple applications, to streamline how day-to-day business gets done.

Kotatogram Desktop, being based on Telegram Desktop, has all its features, but it also has some more useful and cosmetic features.

High-Performance server for NATS.io, the cloud and edge native messaging system.