Citadel Alternatives

Posted in Software

15 best citadel alternatives for Windows, Mac, Linux, iPhone, Android and more. Citadel alternative list source: citadel.org

15 alternativesCommercial, Free, Open Source, Freemium +1 Linux, Web, Windows, Mac

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What is Citadel?

15 best citadel alternatives for Windows, Mac, Linux, iPhone, Android and more. Citadel alternative list source: citadel.org

Who should use these alternatives?

These alternatives are useful when you want to compare similar tools by platform support, licensing signals, practical features, and archived community feedback before visiting official product websites.

Pricing and license note

Pricing, license terms, and availability can change. Check the official website for current pricing and product terms before making a decision.

Safety and legitimacy note

Alternative.tips is an informational alternatives directory focused on legitimate software and web services. We remove or block tools that enable unsafe, abusive, or unauthorized activity.

Originally added: October 17, 2018

Compare Citadel alternatives

Compare top-ranked Citadel alternatives by score, license, and supported platforms.

Alternative	Score	License	Platforms
Kolab Community	92% Archived community votes: 73	Free, Open Source	Web, Linux
Zimbra Collaboration Suite	86% Archived community votes: 57	Commercial	Web, Linux
HMail Server	90% Archived community votes: 49	Free, Open Source	Windows
Microsoft Exchange Server	88% Archived community votes: 33	Commercial	Web, Windows
MDaemon Messaging Server	87% Archived community votes: 31	Commercial	Windows
Zarafa	85% Archived community votes: 27	Commercial	Web, Windows, Mac, Linux
OX Open-Xchange	74% Archived community votes: 23	Free, Open Source	Web, Linux
SophiMail	47% Archived community votes: 15	Commercial	Unknown
Atmail Email Server	53% Archived community votes: 15	Unknown	Web, Linux
EGroupWare	53% Archived community votes: 15	Free, Open Source	Web, Linux
Expanding Communication	64% Archived community votes: 11	Commercial	Linux
IMail	29% Archived community votes: 7	Free	Windows

Archived community votes are historical community signals and are not verified reviews.

Kolab Community

Score: 92%

FreeOpen SourceWebLinux

Simple Groupware is a secure, scalable, reliable, flexible, highly-featured collaboration suite. Features:Free,Open,Source,Linux,Web,Self-Hosted

Zimbra Collaboration Suite

Score: 86%

CommercialWebLinux

Zimbra Collaboration e-mail, calendar, tasks, and more open, secure collaboration tool. Today, the most innovative web application, Zimbra Features:Commercial,Linux,Web

Alternatives

HMail Server

Score: 90%

FreeOpen SourceWindows

HMailServer free email server for Microsoft Windows. All of these internet service providers, companies, governments, schools and enthusiasts Features:Free,Open,Source,Windows

Alternatives

Microsoft Exchange Server

Score: 88%

CommercialWebWindows

Microsoft Exchange Server was developed for messaging and Collaboration software product from Microsoft. Server products, which is part of the Microsoft Server. Features:Commercial,Windows,Web

Alternatives

MDaemon Messaging Server

Score: 87%

CommercialWindows

Low-cost virtual check e-mail for companies or hosted deployments for companies that want to use e-mail server software is easy. Webmail is integrated with the physician Features:Commercial,Windows

Zarafa

Score: 85%

CommercialWebWindowsMacLinux

Open-source collaboration, existing Linux mail server, native mobile phone support, allows integration with the Outlook "Look & feel as the web-access" Features:Commercial,Mac,Windows,Linux,Web

Alternatives

OX Open-Xchange

Score: 74%

FreeOpen SourceWebLinux

Linux-based Groupware solution f-Openexchange-Server-6 advanced. Open-XChange Server 6 is superior in the following areas: • the Open-Xchange server 6 more Features:Free,Open,Source,Linux,Web

SophiMail

Score: 47%

Commercial

Sophias business-critical e-mail for the solution of problems is a fully-featured e-mail and collaboration server is to: maximize your privacy, portability, and cost efficiency, admin & user Features:Commercial,BSD,VirtualBox,Self-Hosted,VMware,vSphere,Hypervisor

Alternatives

Atmail Email Server

Score: 53%

WebLinux

Atmail webmail system Linux, Unix, and windows for web-mail client, email server platform and e-offers device. Features: - Webmail, Calendar, Address Book Features:Commercial,Linux,Web

Alternatives

EGroupWare

Score: 53%

FreeOpen SourceWebLinux

Teamwork Egroupware e-mail client, online calendar, contact and task management, project management and CRM web-based software for Central data and file Features:Free,Open,Source,Linux,Web

Alternatives

Expanding Communication

Score: 64%

CommercialLinux

Corporate E-Mail for the enterprise cloud installation, configuration, and management tools for software development, collaboration, messaging, video conferencing, file Features:Commercial,Linux

Alternatives

IMail

Score: 29%

FreeWindows

Fast, secure, hard-to-E-mail solution. Client access, LAN-or Wan-to-self-hosted-server, maintenance-free design. The Windows Server and the database server required, unlimited Features:Free,Windows,Self-Hosted

Alternatives

SmarterMail Mail Server

Score: 20%

FreemiumWindows

For a fraction of the cost of exchange level smartermail e-mail server software. Lower hardware requirements, superior stability and reduced Features:Freemium,Windows

Xeams

Score: 33%

FreePersonalWindowsMacLinux

Out of the box Xeams junk e-mail, to 99% with a powerful spam filtering engine that eliminates much more secure and powerful E-mail server. Software Features:Free,Personal,Mac,Windows,Linux,BSD

Netrepid Hosted Exchange Services

Score: 33%

CommercialWeb

Best Hosted Exchange-hosted exchange solutions provider, intrepid. Demand-speed technology to accelerate. Features:Commercial,Web

Citadel alternatives FAQ

What is the best Citadel alternative?

Kolab Community is currently the top-ranked option on this list based on community votes and item score.

Are there free Citadel alternatives?

Yes. Free, freemium, or open-source options in this list include Kolab Community, hMail Server, OX Open-Xchange, eGroupWare, iMail.

Which platforms are covered?

The alternatives in this list include options for Linux, Web, Windows, Mac, depending on each product.

How are alternatives ranked?

Alternatives are ordered by community voting signals, item score, and the available product details collected for each option.

Comments

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