Launch Chat

Start a WhatsApp, Signal or Telegram chat without saving a number as a contactGPL-3.0-only

Delta Chat

Chat over e-mail. Elegantly Retro, Decentralized and Open. Privacy by Design.GPL-3.0-or-later

monocles chat

is a secure XMPP chat client for AndroidGPL-3.0-only

Yaaic

IRC (chat) clientGPL-3.0-or-later

SimpleX Chat

SimpleX Chat - e2e encrypted messenger without any user IDs - private by design!AGPL-3.0-or-later

Tensor

Matrix (chat) clientGPL-3.0-or-later

Atomic

IRC (chat) clientGPL-3.0-or-later

Plumble

Voice chat for Mumble serversGPL-3.0-only

Messenger bypasser

Redirects "OpenFB Messenger" intents to the web chatMIT

KouChat

ChatGPL-3.0-only

Gilga

Local chat via BluetoothGPL-3.0-only

Critical Maps

Critical mass location sharing and chatApache-2.0

TripSit

Information, combination charts and a live help chat for recreational drugsGPL-3.0-only

Open in WhatsApp

Open chats in WhatsApp without saving contact to phonebook.GPL-3.0-only

BlueChat

Chat locally over BluetoothMIT

FluffyChat

Chat with your friends with FluffyChat.AGPL-3.0-only

Jami

Audio & Video Calls / Chat Take Control of your Communication!GPL-3.0-or-later

Zulip

The Zulip mobile app, chat for distributed teamsApache-2.0

Quasseldroid

Chat comfortably. Everywhere. REQUIRES A QUASSEL COREGPL-3.0-only

Databag

A federated chat client designed for privacy and selfhosting.Apache-2.0