Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Best Kolab Groupware Alternatives ranked by AI · updated May 2025
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Kolab Groupware is an open-source collaboration platform with email, calendar, and more.
Price: Free and paid versions available
Top 6 Kolab Groupware alternatives
eGroupWare is an open-source groupware and business collaboration platform for organizations managing email, calendars, contacts, files, projects, and customer data. It supports...
Pros
- Combines groupware, CRM, project management, and document management in one platform
- Self-hosting provides more control than Microsoft 365 or Google Workspace
- Includes business-focused modules beyond basic email and calendars
Cons
- Smaller ecosystem and user community than Nextcloud or Microsoft 365
- Interface is less polished than leading commercial suites
- Hosted pricing and deployment options can be harder to compare
Free (self-hosted); hosted plans vary
SOGo is a fully-featured collaboration suite with focus on scalability and simplicity.
Free and paid versions available
Inout Webmail is a self-hosted PHP webmail application for organizations and hosting providers that need browser-based access to email accounts. It provides...
Pros
- Can be deployed on hosting that supports PHP
- Connects to existing mailboxes instead of requiring a new email provider
- More customizable for branded deployments than hosted webmail services
Cons
- Smaller ecosystem and community than Roundcube or Zimbra
- Requires separate mail-server infrastructure and administration
- Less transparent pricing and documentation than open-source alternatives
Baïkal is a lightweight, self-hosted CalDAV and CardDAV server for synchronizing calendars and contacts across desktop and mobile clients. It is designed...
Pros
- Much lighter on server resources than Nextcloud or SOGo
- Provides focused CalDAV and CardDAV functionality without unrelated collaboration features
- Uses common standards supported by Apple, Google, Thunderbird, and mobile clients
Cons
- No integrated webmail, file storage, office editing, or task-management suite
- More manual setup and administration than hosted calendar services
- Smaller ecosystem and slower feature development than Nextcloud
Carbonio is a self-hosted collaboration suite for organizations needing email, calendars, contacts, file sharing, and conferencing. Its Community Edition provides an open-source...
Pros
- Combines mail, calendaring, storage, chat, and conferencing in one platform
- Open-source Community Edition can be self-hosted without per-user licensing
- Provides a migration path for organizations familiar with Zimbra-style groupware
Cons
- More complex to deploy and maintain than hosted collaboration services
- Community Edition has less official support than paid Carbonio editions
- Requires substantial server resources for larger installations
Free Community Edition; paid editions available
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