The best open source alternative to Fluxer is Rocket.Chat. If that doesn't suit you, we've compiled a ranked list of other open source Fluxer alternatives to help you find a suitable replacement. Other interesting open source alternatives to Fluxer are: Mattermost, Zulip, Element, and Campfire.
Fluxer alternatives are mainly Team Chat & Messaging Tools but may also be Encrypted Communication Tools or Video Conferencing & Virtual Office Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Fluxer.
Open-source chat solution offering real-time messaging, video calls, and file sharing for teams of all sizes.

Rocket.Chat is a powerful, open-source communication platform designed to revolutionize the way teams collaborate. With its robust features and flexible deployment options, Rocket.Chat caters to organizations of all sizes, from small startups to large enterprises.
Key benefits of Rocket.Chat include:
Whether you're looking to improve internal team communication, streamline customer support, or create a community platform, Rocket.Chat offers the tools and flexibility to meet your unique needs. Experience the power of open-source communication and take control of your team's collaboration today.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
Mattermost provides a flexible, open-source platform for secure team collaboration, designed for organizations with strict security and privacy requirements.

Mattermost is an open-source collaboration platform built for organizations that require high levels of privacy, security and control over their communications. Some key features and benefits include:
Mattermost is designed for industries like defense, government, financial services, and critical infrastructure that have stringent requirements around data sovereignty and security. It provides a self-hosted alternative to cloud-based tools, giving organizations complete control over their collaboration environment.
The platform aims to improve team productivity and accelerate mission-critical work by providing a centralized hub for communication, process management, and integrations. With its focus on security and flexibility, Mattermost enables organizations to collaborate effectively even in highly regulated or air-gapped environments.
Zulip is an open-source team chat app that uses threaded conversations to keep communication organized and efficient for teams of all sizes.

Zulip is a powerful, open-source team chat application designed to revolutionize how distributed teams communicate. Unlike traditional chat tools that can feel chaotic and stressful, Zulip's unique threading model organizes conversations by topic, making it easy to manage multiple workstreams and stay on top of important discussions.
Key features and benefits:
Threaded Conversations: Zulip's core feature is its topic-based threading, which allows teams to have multiple conversations simultaneously without losing context or creating confusion.
Efficient Communication: The organized structure helps team members quickly catch up on relevant discussions and reduces information overload.
Flexible Deployment: Choose between Zulip Cloud for convenience or self-host the 100% open-source software for ultimate control and compliance.
Cross-Platform Support: Access Zulip from desktop and mobile apps, ensuring seamless communication across devices.
Rich Integrations: Connect Zulip with your favorite tools and services to streamline workflows.
Powerful Search: Easily find past conversations and shared knowledge with Zulip's robust search functionality.
Open Source: Benefit from a transparent, community-driven development process and the ability to customize the platform to your needs.
Zulip is ideal for various use cases:
With its focus on organized communication, Zulip empowers teams to work more efficiently, make decisions faster, and create a searchable knowledge repository as a natural byproduct of their conversations. Whether you're managing a small team or coordinating thousands of contributors, Zulip provides the structure and flexibility needed to succeed in today's distributed work environment.
Open-source platform for encrypted communication, file sharing, and collaboration based on the Matrix protocol.

Element is a powerful, open-source communication platform that puts privacy and security at the forefront. Built on the decentralized Matrix protocol, Element offers a comprehensive suite of features for both personal and professional use.
Key benefits of Element include:
Whether you're an individual seeking secure messaging or an organization looking for a flexible, scalable communication solution, Element provides the tools you need to stay connected while maintaining control over your data and privacy.
Install your own group chat system with @mentions, DMs, and mobile support. One-time purchase, no monthly fees. Includes full source code for customization.

Break free from endless subscription fees with this self-hosted group chat solution that puts you in complete control. If you've used Slack or Teams, you already know how to use Campfire - but without the monthly charges that never end.
Key features include:
Perfect for multiple use cases:
Technical advantages:
You get the complete Rails source code, allowing full customization for your specific needs. One-time purchase, no recurring fees - own your chat system and your data forever.
Modern chat platform featuring text channels, community building tools, fine-grained permissions, and complete privacy protection. Open-source and ad-free.

Stoat (formerly Revolt) is a modern chat application that puts you at the center of your communication experience. This privacy-first platform offers a refreshing alternative to mainstream messaging apps with its commitment to user control and data protection.
Key Features:
Privacy & Security:
Whether you're building a community, managing a team, or just chatting with friends, Stoat provides the tools you need while respecting your privacy. The platform combines modern chat features with old-school principles of user ownership and data protection.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
A comprehensive collaboration platform offering end-to-end encrypted messaging, file sharing, and video calls with enterprise-grade security and compliance features.

Wire delivers military-grade security without sacrificing user experience. The platform features always-on end-to-end encryption for messages, files, and calls, while maintaining an intuitive interface for seamless team collaboration.
Key capabilities include:
Trusted by industry leaders including BMW, ExxonMobil, and government organizations worldwide, Wire ensures your sensitive communications remain private and compliant. The platform is particularly valuable for organizations requiring:
Build your own community space for gaming, chatting, and hanging out with friends worldwide. Customize your environment for the perfect social experience.

Mezon is a comprehensive community platform designed for gamers and social enthusiasts who want to create their own digital hangout spaces. Whether you're looking to organize gaming sessions, chat with friends, or build a thriving community, Mezon provides all the tools you need.
The platform allows you to create fully customized spaces tailored to your group's interests and needs. You can set up dedicated channels for different games, topics, or activities, making it easy to keep conversations organized and engaging.
Key features include:
Perfect for gaming clans, hobby groups, study communities, or casual friend circles, Mezon adapts to any social dynamic. The platform makes it simple to invite friends, discover new communities, and maintain active engagement through intuitive design and robust communication features.
Free Matrix-based messenger with end-to-end encryption, multi-platform bridges, and on-premise deployment. Connect across 30+ networks securely.

Secure and private by design, Twake Chat leverages the Matrix protocol for decentralized communication that puts you in control. This free and open source messenger delivers enterprise-grade security with end-to-end encryption while maintaining simplicity for both work and personal use.
Key features that set Twake Chat apart:
Perfect for professional teams who need secure communication without compromising on functionality. The Matrix protocol ensures your data remains decentralized rather than controlled by a single entity, while customizable security levels let you add extra encryption when needed.
Whether you're managing team collaboration or need a reliable messaging solution that respects privacy, Twake Chat provides the security and flexibility modern organizations require.
Open source chat server with end-to-end encryption, clustering support, and comprehensive messaging features for building real-time communication apps

SAMA is a powerful open source chat server designed for modern mobile and web applications. It offers enterprise-grade security with built-in end-to-end encryption and seamless scalability through out-of-the-box clustering support.
Key features include:
The platform comes with a modern frontend client, clustering-enabled backend, admin dashboard, and comprehensive API documentation - everything needed to build secure and scalable chat applications.