Alternatives to: Google Chat

Zulip is an Open Source team chat application that combines the best of email and chat for enhanced team communication and productivity.

Rocketchat

Rocket.Chat is a secure, collaborative communication platform that enables real-time communication and streamlined workflows for teams and organizations.

ThreemaEducation

Threema Education offers a secure, private, and affordable instant messaging solution for schools and universities, facilitating efficient communication while protecting student and teacher data.

MikroChat is a minimalist, self-hosted chat app for teams that offers full control over communication with essential features and no vendor lock-in.

Infomaniak kChat is a secure, AI-powered instant messaging platform for businesses, designed for enhanced collaboration and data privacy.

Treebal Pro is a secure, ethical, and sovereign instant messaging platform for organizations, offering customizable communication management with a focus on privacy, efficiency, and environmental responsibility.

Wire

Wire is a secure collaboration platform providing end-to-end encrypted communication and file sharing for individuals, businesses, and governments.

Prose is a modern, secure, and decentralized XMPP client for efficient team messaging.

Mattermost

Mattermost is a secure and adaptable collaboration platform designed for mission-critical work in highly regulated environments.

Mostlymatter

Mostlymatter is an Open Source, unlimited-user fork of Mattermost for secure team collaboration.

OpenTouch Message Center

OpenTouch Message Center (OTMC) was a unified messaging application providing voicemail, fax, and email management, but is now discontinued.

Threema Work

Threema Work is a secure and compliant business messenger that enhances team communication and boosts productivity while ensuring data privacy and compliance with regulations.

AtomJump is an open-source, no-download-required messaging PWA with expandable plugins, supporting global communication and privacy-focused features.

Fleep

Fleep is a secure and user-friendly business messenger designed to simplify team communication and collaboration.