Top 15 Citadel Alternative and Similar Softwares | Dec 2024

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.

1. OBM

OBM OBM is a free messaging and collaboration platform useful for just a couple to many thousands of users with strong support for mobile devices.......

2. OX Open-Xchange

OX Open-Xchange Open-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 most comprehensive Groupwarefunctionality based on modern user interface technologies and includesemail, calendaring, contact management, intelligent document sharing,“smart linking” and much more.• The architecture is designed for......

3. Alinto

Alinto Established in January 2000, Alinto is one othe principal french editors and operators of collaborative messaging and unified communications. Alinto manages over 4000 areas of professional messaging and more than a million users in 5 countries. Alinto relies on a team that has expertise in electronic communication for over fifteen......

4. Zarafa

Zarafa Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI).......

5. Wimi

Wimi Wimi is the ultimate productivity tool. It integrates all the essential applications to facilitate teamwork. Wimi saves time to managers and entrepreneurs working with teams and clients.Wimi includes many worthy functionnalities :- file sharing - multi-device and cloud synchronization for documents- fine access right management- task management- calendar sync and......

6. Zimbra Collaboration Suite

Zimbra Collaboration Suite 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.Other key advantages include advanced compatibility with existing desktop email clients,......

7. Qortex

Qortex Qortex is a web-based next-generation platform for collaboration and knowledge-building within your group or company.Special features are: use chat with your client, save into Qortex and share it there. Convert chats to posts to wiki entries for knowledge building. Share groups/folders with other companies/organizations. Full WYSIWYG editor for writing, or......

8. eXo Platform

eXo Platform eXo Platform is a cloud-ready enterprise portal and user experience platform-as-a-service (UXPaaS) for building and deploying transactional websites, managing web and social content and creating gadgets and dashboards. Built on open standards and open source technologies, eXo Platform has the features and extensibility of a UXP and the cloud architecture......

9. Qlubb

Qlubb Qlubbs are the easiest way to communicate and share with other families in your childs classroom......

10. Blue-Mind

Blue-Mind Blue Mind is a complete solution of company messaging, calendars and collaborative work. It aims to enable you to work daily with comprehensive, useful, efficient and effective tools.......

11. GroupSpaces

GroupSpaces Free group website, membership database, listserv mailing list, payments and more - GroupSpaces is a market leader in online group management software, providing comprehensive, simple to use tools to help manage your group more quickly and efficiently. Easy-to-use, secure & time-saving. Used by 10 000s of membership groups. Try it......

12. phlyMail

phlyMail phlyMail is an advanced webmail and groupware solution featuring unlimited profiles, multiple users, a calendar, contacts list and much more......

13. Axigen

Axigen Axigen is an integrated email, calendaring & collaboration platform, built on a unique Linux mail server technology, for increased speed & security.......

14. Hall

Hall Real-time chat & texting for business teams.Free on Mac, Windows, Web, Android, and iPhone** Why Business Teams Love Using Hall **Group & Private ChatEasily message one-on-one or in groups with users in- or out-of-network. No need for a work email address.Syncs Across All DevicesHall syncs seamlessly and persistently across Mac,......

15. Kablink

Kablink Kablink is the first Enterprise suite for team collaboration built on an Open Source project to unify team workspaces with real-time conferencing, while encouraging rapid user adoption through social networking software.......