Citadel Alternatives
Citadel
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 messaging, and built-in implementations of Internet protocols such as SMTP, IMAP, Sieve, POP3, GroupDAV and XMPP. All protocols offer OpenSSL encryption for additional security.
Users of Citadel/UX systems also have available to them a web-based user interface which employs Ajax style functionality to allow application-like interaction with the system.
Citadel uses the Berkeley DB database for all of its data stores, including the message base.
Best Citadel Alternatives
Looking for some programs similar to Citadel? Here are the top-recommended programs we found. Let's take a look if there's anything out there that helps you on whatever platform you're using.
Kolab Community
FreemiumOpen SourceLinuxWebSelf-HostedKolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
Features:
- CalDAV
- CardDAV
- Real time collaboration
- Support for WebDAV
Zimbra Collaboration Suite
FreemiumOpen SourceLinuxWebSelf-HostedZimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra...
Features:
- Active Directory integration
- ActiveSync
- Email Server
- Real time collaboration
- Team Collaboration
hMail Server
FreeOpen SourceWindowshMailServer 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...
Features:
- Convert images to PDF
- Support for IMAP
- Email Server
- POP3 Support
- SMTP
- SMTP integration
MDaemon Messaging Server
CommercialWindowsLow 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...
Features:
- Dropbox integration
- Encrypted Email
- Group chat
- Support for IMAP
- Email Server
- Mobile Device Management
- Outlook integration
Microsoft Exchange Server
CommercialWindowsWebIntelligent inbox and calendar software that's a part of the Microsoft Office Suite.
Features:
- Email Server
- Real time collaboration
Zarafa
CommercialMacWindowsLinuxWebOpen Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and...
Features:
- Email Server
- Real time collaboration
OX Open-Xchange
FreeOpen SourceLinuxWebSelf-HostedOpen-Xchange Server 6 is the most advanced Linux based Groupware solution f. Open-Xchange Server 6 is superior in the following areas: • Open-Xchange Server 6 offers...
Features:
- Calendar integration
- German
- Group Mail
- Email Server
- Real time collaboration
- Support for WebDAV
Atmail Email Server
CommercialLinuxWebAtmail webmail system offers a webmail client, email server platform and mailserver appliance for Linux, Unix and Windows. Features: Webmail Calendar Addressbook ...
Features:
- File sharing
- File-sync
- Group Mail
- Email Server
iMail
CommercialWindowsSelf-HostedFast, safe, heavy mail solution. Web-client access, LAN or WAN self-hosted server, maintenance-free design. No Windows server and database server required, unlimited...
Sanwhole Exchange
CommercialWindowsSanwhole Exchange is a server running iMail, iPress and iStore services. iMail is an enterprise-class email server does Microsoft Exchange and Gmail work. iPress sets...
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