Citadel AlternativesWebMail Providers and other similar apps like Citadel
Citadel is described as 'Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD. In order to modernize the Citadel platform for the Internet, the Citadel/UX developers added functionality such as shared calendars, instant' and is a webmail provider in the office & productivity category. There are more than 10 alternatives to Citadel for a variety of platforms, including Linux, Web-based, Windows, Self-Hosted and Mac apps. The best Citadel alternative is Kolab Community, which is both free and Open Source. Other great apps like Citadel are Zimbra Collaboration Suite, hMail Server, Microsoft Exchange and SmarterMail Mail Server.
- WebMail Provider
- Free • Open Source
Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.
License model
- Freemium • Open Source
Application types
Country of Origin
Switzerland
Platforms
- Linux
- Online
- Self-Hosted
Kolab Community Features
- 44 Zimbra Collaboration Suite alternatives
Zimbra 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.
License model
- Freemium • Open Source
Application types
Country of Origin
United States
Platforms
- Linux
- Online
- Self-Hosted
Zimbra Collaboration Suite Features
- 23 hMail Server alternatives
hMailServer 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.
DiscontinuedhMail Server is no longer supported by the people who created it and has been discontinued – so use it at your own risk.
hMail Server Features
- 43 Microsoft Exchange alternatives
Exchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.
License model
- Paid • Proprietary
Application type
Country of Origin
United States
Platforms
- Windows
- Online
- Self-Hosted
- Microsoft Office 365
Microsoft Exchange Features
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.
License model
- Paid • Proprietary
Application types
Country of Origin
United States
Platforms
- Windows
- Linux
- Docker
- 19 OX App Suite alternatives
The 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.
License model
- Free • Open Source
Application types
Country of Origin
Germany
EU
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
OX App Suite Features
Real-time email, chat, audio/video calls & conferences, file-sharing, and contacts app with a modern and intuitive UI.
License model
- Paid • Proprietary
Application types
Country of Origin
Bosnia & Herzegovina
Platforms
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
CrossBox Features
- 24 MDaemon Messaging Server alternatives
Low 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.
License model
- Paid • Proprietary
Application types
Country of Origin
United Kingdom
Platforms
- Windows
MDaemon Messaging Server Features
- 24 EGroupware alternatives
Online Collaboration with Chat and Online Office. Is developed as open source software in Germany, offered as free community version and as commercial version. Operation as self-hosted or as SaaS from the computer centre.
License model
- Freemium • Open Source
Application types
Country of Origin
Germany
EU
Platforms
- Linux
- Online
- Self-Hosted
- Software as a Service (SaaS)
EGroupware Features
Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).
License model
- Paid • Proprietary
Application types
Platforms
- Mac
- Windows
- Linux
- Online
Discontinued"Last year we released the announcement that Zarafa customers could transition to Kopano. We also announced that Zarafa would not be maintained beyond May 1st, 2017. Most ZCP customers have moved to a Kopano subscription now."
Zarafa Features
Atmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows.
License model
- Paid • Proprietary
Application types
Country of Origin
Australia
Platforms
- Linux
- Online
Atmail Email Server Features
Turnkey Solutions for the Enterprise Cloud
Installation, Configuration, and Management tools for enterprise email, collaboration, messaging, video conferencing, file sharing, and file transfers.
Expanding Communication Features