European Slack Alternatives

Matrix.org offers a revolutionary approach to digital communication through its open protocol for secure, decentralized messaging. Unlike traditional messaging platforms, Matrix creates an open network where users maintain control over their data and communications.

The platform enables seamless communication across different applications and services, breaking down the silos that typically separate messaging platforms. Users can chat with friends, family, communities, and co-workers through a unified protocol that prioritizes privacy and security.

Key features include:

• End-to-end encryption for all communications
• Decentralized architecture preventing single points of failure
• Cross-platform compatibility across multiple clients and devices
• Rich ecosystem of clients, servers, bots, and application services

Matrix serves as both a communication platform and a development foundation for building advanced messaging applications. The protocol supports everything from simple text messaging to complex collaborative tools, making it ideal for communities, organizations, and developers seeking secure communication solutions.

The Matrix.org Foundation guides the protocol's development, ensuring it remains open, secure, and accessible to all users while fostering innovation in decentralized communication technology.

Transform your browser into a complete business workspace with email, team chat, video conferencing, and document collaboration all integrated seamlessly. This EU-made platform eliminates the need for multiple tools by bringing everything together in one interface.

Key features include:

• Professional email with custom domains and ChatGPT integration for enhanced productivity
• TeamChat and video conferencing supporting up to 1,000 attendees with webinar mode
• Real-time document collaboration for creating and editing docs, spreadsheets, and presentations
• Shared calendars with appointment booking and task management
• Cloud storage with file sharing and mobile access

Choose between cloud hosting or self-hosted deployment for complete control over your data. The platform offers flexible pricing starting at $3.50/user/month and includes a 30-day free trial with full feature access.

Mobile and desktop apps ensure productivity anywhere, while managed migration services make switching from Microsoft 365, Google Workspace, or other platforms seamless. Trusted by 50,000+ businesses worldwide with 24/7 enterprise support available.

Wire is a Swiss-based secure collaboration platform that provides always-on end-to-end encryption without compromising usability. Trusted by over 1,800 organizations worldwide, Wire offers seamless communication through instant messaging, file sharing, and video meetings.

Key features include:

• Zero-knowledge encryption that keeps data protected and compliant
• Flexible collaboration across teams and external parties
• SAML-based Single Sign-On and SCIM support for enterprise
• Complete data sovereignty with on-premises deployment options
• Granular administrative controls for complex organizations

Wire serves as a European alternative to Microsoft Teams and Slack, particularly valuable for organizations requiring NIS2 compliance and data protection. The platform supports government agencies, law enforcement, and enterprises with federated environments and ID Shield protection.

With crisis communication capabilities and comprehensive support for distributed teams, Wire enables secure collaboration without the typical security friction that hampers productivity.

Stackfield is a comprehensive collaboration platform designed specifically for organizations handling sensitive data. Built and hosted in Germany, this all-in-one solution combines project management, team communication, and document collaboration with military-grade end-to-end encryption.

Key features include:

• Task management and workflows with clear visibility for all team members
• Real-time project communication through group chats, discussions, and comments
• Video conferencing and screen sharing for efficient remote collaboration
• Collaborative document editing with centralized knowledge management
• Interactive whiteboards for brainstorming and process visualization
• Timeline and portfolio views for comprehensive project oversight

Security is paramount - all data is encrypted directly in your browser before transmission, ensuring that even Stackfield cannot access your messages, files, or tasks. The platform meets ISO 27001 certification standards and complies with EU-GDPR regulations.

Trusted by over 10,000 companies since 2012, Stackfield serves government agencies, banks, insurance companies, law firms, and universities that require the highest levels of data protection. Available across all devices with 2-factor authentication, Single Sign-On, and DDoS protection for enterprise-grade security.

Element offers a secure and sovereign communications platform, built by the creators of the Matrix open standard. It provides end-to-end encrypted messaging and collaboration, ensuring your business-critical communications are protected. A key benefit is data sovereignty, achieved through its open-source nature and flexible hosting options, allowing you to self-host or use a managed service like Element Matrix Services. This decentralised approach facilitates trusted real-time communication across different organisations.

Key features include:

• End-to-end encryption: Keeps your conversations private.
• Decentralised network: Built on Matrix for interoperability and control.
• Flexible hosting: Choose between self-hosting for complete data ownership or fully managed deployments.
• Open source: Offers transparency and customisation.
• Interoperability: Connect easily with others on the Matrix network.

Element empowers users to communicate and collaborate with confidence, providing the freedom to structure discussion spaces and manage data according to specific requirements. It is trusted by organisations worldwide for its robust security and commitment to user control.

Discover a chat application built with your control and community at its heart. This platform allows you to create and manage your online spaces exactly how you envision them.

Key aspects include:

• Advanced Text Channels: Share images, @mention users, and link to websites effortlessly in well-structured text channels.
• Powerful Community Management: Build thriving communities with fine-grained permission controls, comprehensive moderation tools, and support for bots to enhance engagement.
• Unmatched Customization: Personalize the application's appearance to match your style. It's completely free and open-source, giving you true ownership.
• Commitment to Privacy: Communicate securely knowing your data is protected. The platform features no advertisements and no trackers, and is developed in Europe, adhering to GDPR principles.
• Modern Direct Messaging: Connect with individuals or groups through an intuitive system for direct messages and group chats.

Forge your community on a platform that prioritizes freedom, customization, and privacy.

Organize your personal and business life with a tool designed for simplicity and effective task management. Since 2007, users have chosen this platform to get things done without overwhelm. It's intuitive like email but far more structured, helping your team adapt quickly and focus on priorities.

Key benefits:

• Fewer, Efficient Meetings: Manage work asynchronously in projects and tasks, reducing status updates. Meetings become shorter and more effective with documented discussions.
• Increased Team Productivity: Help your team achieve more. Track all tasks and commitments, ensuring nothing is missed, leading to better results.
• Flexible Remote & Hybrid Work: Access work from anywhere with cross-platform apps (Mac, Windows, Android, iOS) that sync and work offline. Your office in the cloud.
• Better Work-Life Balance: Separate professional and private workspaces to maintain focus and efficiency in all areas of life.

Core features include Projects, Tasks with deadlines, Comments for clear communication, and customizable Views. Convert emails to tasks, use project templates, and share projects externally.

Fluxer is a free and open-source instant messaging and VoIP platform developed in Sweden, designed to put users first. Built for friends, groups, and communities, it offers a comprehensive communication solution without compromising on privacy or control.

Key Features:

• Full messaging suite with Markdown support, private DMs, group chats, and organized channels
• Voice and video calls with multi-device support, screen sharing, noise suppression, and echo cancellation
• Advanced moderation tools including granular roles, permissions, audit logs, and webhook support
• Powerful search functionality with message history filtering and quick switcher with keyboard shortcuts
• Extensive customization options including custom emojis, CSS themes, and compact display modes

Self-Hosting Capabilities: Run your own Fluxer instance with the fully open-source backend (AGPLv3 license). Connect using desktop clients with mobile apps coming soon, and easily switch between multiple instances.

Community-Driven Development: Fluxer is built transparently with community involvement through bug reporting, code contributions, and localization efforts. The platform offers bug bounty programs and maintains active communication channels for user feedback and feature discussions.

Leviia Next is a comprehensive collaborative suite built on Nextcloud open-source technology, designed specifically for organizations seeking digital sovereignty and independence from Big Tech. This French solution combines all essential workplace tools in one secure platform.

Core Features:

• File Storage & Sharing: Centralized file management with advanced permissions, seamless sync across all devices, and effortless sharing with internal and external partners
• Real-time Document Editing: Co-edit .docx, .xlsx, and .pptx files directly online with OnlyOffice integration, featuring full version history and change tracking
• Integrated Communication: Built-in chat and video conferencing through Nextcloud Talk, with screen sharing and end-to-end encryption
• Office Tools: Collaborative calendar, task management (Deck), forms, polls, and upcoming integrated email client

Sovereignty & Security:

• 100% French infrastructure with ISO27001 & HDS certification
• Data is geo-distributed across 3 distinct data centers in France
• Zero American or Chinese dependencies - built entirely on open-source code
• End-to-end encryption and advanced ransomware protection

Scalability & Flexibility:

• Supports individual users to hundreds of thousands of users
• Unlimited storage and users on Pro plans
• SSO integration and customizable deployment options
• Compatible with all major platforms (Windows, macOS, Linux, iOS, Android)

As a Nextcloud Platinum Partner, Leviia provides expert technical support and custom implementations, making it the ideal choice for organizations prioritizing data sovereignty without compromising on functionality or performance.

VNClagoon is a comprehensive suite of integrated communication and collaboration solutions designed for modern enterprises. Built on reliable open-source technology, it provides a secure alternative to established software giants with lower upfront costs and ongoing expenses.

Key features include:

• Unified communication platform combining messaging, video conferencing, email, and project management
• End-to-end data protection with the highest security standards
• Complete visibility into all interactions on one centralized dashboard
• Flexible integrated tools for seamless workflow management
• Digital sovereignty - retain full control over your data

The platform offers purpose-built applications for secure interactions of all kinds, including VNCtalk for messaging, VNCmail for email, VNCcalendar for scheduling, and VNCproject for task management. Automated testing and continuous development ensure bulletproof software reliability.

Trusted by organizations including DFB GmbH, Federal Employment Agency, and Vodafone Group, VNClagoon serves system integrators, financial institutions, healthcare providers, and government agencies worldwide. Based in Switzerland, Germany, and India, VNC delivers enterprise-grade solutions that enable secure collaboration from anywhere, on any device.

Professional messaging designed for modern teams that need to stay connected across organizations. Whether you're managing internal team chats, coordinating projects, or handling one-on-one conversations, this platform brings all your work communications into a single, unified space.

Key features that make collaboration effortless:

• Task management - Create and track team tasks with progress monitoring
• Pinboard functionality - Highlight important announcements to keep everyone informed
• File sharing and drawer - Capture photos, share files, and access them across all devices
• Email integration - Send and receive emails directly within the platform
• Cross-organization messaging - Communicate seamlessly with partner companies using the same platform

Universal device compatibility ensures your team stays connected whether they're desk-bound or mobile, using personal or company devices. The platform works across all makes and models, providing flexibility for diverse work environments.

Built with security in mind for companies that prioritize digital safety. Starting from €5 per month, it offers an affordable solution for teams looking to consolidate their communication tools and improve operational efficiency.

mosa.cloud delivers a complete digital workspace solution that prioritizes data sovereignty and organizational control. Built on open source foundations trusted by 200,000+ French government users, this European platform offers everything teams need without compromise.

Core Features:

• Collaborative Docs with real-time editing, version history, and AI assistance
• Secure Drive storage with Collabora integration for in-browser document editing
• HD Video Meetings with automatic transcripts and action items
• Team-focused Mail with shared inboxes and AI-powered organization
• Integrated Chat via Matrix server and Element client
• Grist Spreadsheets for collaborative data management

Key Advantages:

• 100% EU-hosted with data sovereignty guarantees
• Pay-per-usage pricing instead of per-seat licensing
• Open source foundation prevents vendor lock-in
• AI assistance that respects privacy - no training on your data
• Single sign-on across all applications with external collaboration support
• Enterprise security with MFA, audit trails, and NIS2 compliance

The platform integrates seamlessly with existing identity providers while enabling secure collaboration with external partners. Built by a true European service provider, mosa.cloud combines the best open source productivity tools into a fully managed workspace solution.