Zulip is a powerful, open source group chat application. It supports both private messaging and group chats via conversation streams. Zulip also supports fast search, drag-and-drop file uploads, image previews, group private messages, audible notifications, missed-message emails, desktop apps, and much more.

Zulip - Group Chat

Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distributing and persisting JSON over an open federation of servers. It can be used for Decentralised Group Chat, WebRTC signalling, Internet of Things, VOIP etc.

Matrix - Decentralized group communication

Gajim  is a fully-featured XMPP client. It is decentralized messaging platform, Connect to your contacts using a server of your choice. Share pictures, videos, and files with friends and groups. It is end-to-end encrypted, Chat securely using OMEMO, PGP, or OpenPGP. 

Gajim - A fully-featured XMPP client

Ring is a free and universal communication platform which preserves the users' privacy and freedoms. It is a simple tool to connect, communicate and share. It has support of teleconference, easily join calls to create conferences with multiple participants. It helps to send text messeges during calls or out of calls (as long as your peer is connected).

Ring - Universal communication platform which preserves the users privacy and freedoms

Instantbird is a cross platform instant messaging software. It supports various protocols and using this software you could use Facebook, Twitter, Google talk, IRC chat and lot more.

Instantbird - Instant Messaging

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Projects

Zulip - Group Chat

Matrix - Decentralized group communication

Gajim - A fully-featured XMPP client

Ring - Universal communication platform which preserves the users privacy and freedoms

Instantbird - Instant Messaging

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Projects

Zulip - Group Chat

Matrix - Decentralized group communication

Gajim - A fully-featured XMPP client

Ring - Universal communication platform which preserves the users privacy and freedoms

Instantbird - Instant Messaging

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