grommunio – Open-source groupware and collaboration platform for enterprises
Native Exchange Replacement for email, calendars, contacts, groupware, and digital sovereignty
Central Platform for Communication and Collaboration
grommunio provides a modern open-source platform for email, calendars, contacts, collaboration, and digital communication. Companies benefit from a controllable Linux-based communication and collaboration platform focused on digital sovereignty, data protection, and flexible infrastructure concepts.
The platform combines classic groupware features with modern collaboration services such as email, calendaring, video conferencing, team chat, file management, browser-based office editing, mobile device management, and centralized authentication.
Native Exchange Replacement instead of proprietary communication platforms
Many organizations today are looking for alternatives to proprietary cloud and communication platforms. At the same time, requirements for data protection, infrastructure control, digital sovereignty, and Linux-based platform strategies are increasing.
grommunio provides a native Exchange Replacement for email, calendars, contacts, and collaboration. Companies retain full control over communication data, user management, integrations, and infrastructure.
Technical Architecture and Linux Infrastructure
The technical foundation of grommunio is based on modern Linux and open-source technologies. Typical components include Linux, MariaDB, Redis, Postfix, Nginx, rspamd, and centralized authentication services.
The platform can be operated in traditional, virtualized, containerized, or highly available Linux infrastructure environments.
grommunio-web
Browser-based groupware interface for email, calendars, contacts, and tasks
grommunio-chat
Team chat and messaging platform based on Mattermost
grommunio-meet
Video conferencing and meeting platform based on Jitsi
grommunio-files
File management and collaboration platform based on Nextcloud
grommunio-office
Browser-based office and document editing based on ONLYOFFICE
grommunio-auth
Single sign-on and centralized authentication
grommunio-antispam
Spam filtering and email security based on rspamd
grommunio-MDM
Mobile Device Management for mobile devices
grommunio-archive
Email archiving and compliance based on Mailpiler
Comparison point 1
- Advantages of grommunio
- Linux-based open-source groupware
- Disadvantage of other providers
- Vendor lock-in and licensing costs
Comparison point 2
- Advantages of grommunio
- Alternative to Microsoft 365 and Exchange
- Disadvantage of other providers
- Strong dependency on Microsoft ecosystems
Comparison point 3
- Advantages of grommunio
- Controllable infrastructure
- Disadvantage of other providers
- Less control over data and systems
Comparison point 4
- Advantages of grommunio
- Data protection and digital sovereignty
- Disadvantage of other providers
- Data often stored outside the EU
Comparison point 5
- Advantages of grommunio
- Single sign-on and centralized user management
- Disadvantage of other providers
- Higher administrative effort
Comparison point 6
- Advantages of grommunio
- Video conferencing, chat, and collaboration
- Disadvantage of other providers
- Additional tools or licenses required
Comparison point 7
- Advantages of grommunio
- Browser-based office editing
- Disadvantage of other providers
- Limited web functionality
Comparison point 8
- Advantages of grommunio
- Email archiving and compliance
- Disadvantage of other providers
- Compliance often only available as add-on
Comparison point 9
- Advantages of grommunio
- Modular platform architecture
- Disadvantage of other providers
- Less flexibility for extensions
Frequently Asked Questions about grommunio
What is grommunio?Show answerHide answer Action: Open answerClose answer
grommunio is an open-source platform for email, calendars, contacts, collaboration, and digital communication within your own infrastructure.
Is grommunio an alternative to Microsoft 365?Show answerHide answer Action: Open answerClose answer
Yes. grommunio is particularly well suited as a controllable open-source alternative to Microsoft 365 and Microsoft Exchange.
Can grommunio run on Linux?Show answerHide answer Action: Open answerClose answer
Yes. grommunio is especially suitable for Linux-based server and infrastructure environments.
Does grommunio support Single Sign-On?Show answerHide answer Action: Open answerClose answer
Yes. Supported standards and integrations include OpenID Connect, OAuth2, LDAP, Active Directory, and SAML.
Does grommunio support video conferencing?Show answerHide answer Action: Open answerClose answer
Yes. Browser-based video conferencing powered by Jitsi is available through grommunio-meet.
Does grommunio support team chat?Show answerHide answer Action: Open answerClose answer
Yes. A team communication platform based on Mattermost is available through grommunio-chat.
Does grommunio support digital sovereignty?Show answerHide answer Action: Open answerClose answer
Yes. Organizations retain control over communication data, infrastructure, integrations, and security policies.
Integration with XWiki and OpenProject
Especially in combination with XWiki and OpenProject, powerful European open-source collaboration platforms emerge for email, knowledge, projects, and digital sovereignty.
XWiki
XWiki is an open-source platform for enterprise knowledge management and documentation.
With grommunio:
Together, they provide a privacy-focused collaboration solution for communication, documentation, and centralized user management.
OpenProject
OpenProject is an open-source platform for project management, task management, and team planning.
With grommunio:
Together, they provide an integrated solution for communication, collaboration, and project management — privacy-focused and fully under your control.
Recommended next step
From the product decision, the next step leads into architecture, implementation or operations.
Collaboration
Understand the product family in context and compare alternatives.
Implementation & Migration
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Discuss the project
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Practice & technical insights
Practical follow-up articles covering installation, operations, architecture and implementation steps for this product.
Install grommunio 2026 as a collaboration platform
From verified ISO to production groupware: appliance installation, domain, users, Admin UI, web login, test mail and operational baseline.
Operate grommunio-antispam for secure groupware
Set up Rspamd in grommunio for production: WebUI, GTUBE, Bayes training, whitelist/blacklist maps, DKIM context and operations.
Run grommunio-auth with Keycloak in production
Central sign-in for grommunio: grommunio-auth, Keycloak, realm, user federation, MFA, login test, logout redirect and hardening.
grommunio Meet 2026 step by step
Set up grommunio Meet: web integration, Jitsi components, Videobridge, UDP/ICE, SSO adapter and multi-user test.
grommunio Chat 2026 step by step
Practical guide for grommunio Chat: installation, database, nginx upstream, domain teams, WebSockets, two users and multi-tenancy.
grommunio Files and Office 2026 step by step
Practical guide for grommunio Files and Office: installation, Web entry, SSO classification, DOCX/XLSX/PPTX, sharing, saving, backup and troubleshooting.
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Related solution cluster
This product belongs to the ForgeOne Collaboration solution cluster. The hub explains the architecture, related services and the operational context for implementation, migration and integration.