Citadel Alternatives for Linux
There are many alternatives to Citadel for Linux if you are looking for a replacement. The best Linux alternative is Kolab, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Citadel and ten of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Citadel are Zimbra Collaboration Suite, SmarterMail Mail Server, OX App Suite and EGroupware.
Alternatives list
46 Zimbra Collaboration Suite alternativesZimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.
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SmarterMail is the only other email server on the market with native support for MAPI, the protocol that powers Exchange and Outlook. That means anything you can do on Exchange you can do with SmarterMail: no plug-ins and no additional software required.
Cost / License
- Paid
- Proprietary
Application types
Platforms
- Windows
- Linux
- Docker
+5
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20 OX App Suite alternativesThe OX App Suite by Open-Xchange is web-based platform offering a suite of apps like an email client, calendar, contacts magement, cloud storage with synchronization and productivity apps for word processing, spreadsheets and presentations.
Cost / License
- Free
- Open Source
Application types
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
+6
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Web-based team collaboration suite combining email client, calendar, contact and task tools, CRM, project and file management, file sharing, trouble tickets, Rocket.Chat chat, and Collabora online editing. Offers open source, self-hosted, and SaaS options.
Cost / License
- Freemium
- Open Source (GPL-2.0)
Application types
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
+6
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Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).
Cost / License
- Paid
- Proprietary
Application types
Alerts
- Discontinued
Platforms
- Mac
- Windows
- Linux
- Online
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Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
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Turnkey Solutions for the Enterprise Cloud
Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.
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Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that eliminates up to 99% of junk email right out of the box. The software offers a flexible approach to email, making it a very user friendly server.
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Cost / License
- Free
- Proprietary
Application type
Platforms
- Linux
- BSD
- FreeBSD
- Debian
- Ubuntu
- Slackware
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