Citadel AlternativesWebMail Providers and other similar apps like Citadel
Apps similar to Citadel include Kolab, which is open source with a free version. Other options are Zimbra Collaboration Suite, hMail Server, Microsoft Exchange and OX App Suite. You can choose from more than 10 Mail Servers like Citadel for Linux, the web, Windows, self-hosting and Mac.
Alternatives list
55 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.
Cost / License
- Paid
- Proprietary
Application typeApplication types
Platforms
- Linux
- Online
- Self-Hosted
United States
C
23 hMail Server alternativeshMailServer is a free e-mail server for Microsoft Windows. Its used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world.
Platforms
- Windows
C
48 Microsoft Exchange alternativesExchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Windows
- Online
- Self-Hosted
- Microsoft Office 365
- United States
+1
C
22 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 typeApplication types
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
Germany
EU
+6
C
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 typeApplication types
Platforms
- Windows
- Linux
- Docker
- United States
+5
C
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
Cost / License
- Paid
- Proprietary
Application typeApplication types
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
Bosnia & Herzegovina
+9
C
28 MDaemon Messaging Server alternativesLow cost, easy to use Email Server software for virtual, on-premise, or hosted deployments for companies that want control of their email. Integrated web-mail with doc sharing, Drop Box integration, client and server side encryption.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Windows
United Kingdom
+5
C
23 EGroupware alternativesWeb-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 typeApplication types
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
- Germany
- EU
+6
C
Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).
Platforms
- Mac
- Windows
- Linux
- Online
C
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
Cost / License
- Paid
- Proprietary
Application typeApplication types
Platforms
- Linux
- Online
Australia
C
Turnkey Solutions for the Enterprise Cloud
Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.
Cost / License
- Paid
- Proprietary
Application type
Platforms
- Linux
C
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