Audience
Businesses needing a powerful Mail Server solution
About Citadel
Email, collaboration, groupware, and content management - up and running in minutes, on your own hardware, or in the cloud. Citadel is easy, versatile, and powerful, thanks to its exclusive room-based architecture. No other platform seamlessly combines so many different features using this familiar and consistent metaphor. Citadel is 100% open source software using the GNU General Public License. It's not a crippled, cut-down version of some expensive "enterprise" edition. The software you download here is the very best available, and it's all free software.
Other Popular Alternatives & Related Software
Citadel.one
Stake, send, and exchange your crypto assets with a user-friendly non-custodial platform. Join the world of DeFi with staking derivatives and Citadel.one DAO. Non-custodial staking platform, multi-asset support, stake with Citadel.one One-seed, Ledger, Trezor, Metamask or Keplr. Stake on any validator of your choice, unified experience with multiple networks, instant cryptocurrency exchange and fiat gateway. Biweekly report on your staking rewards. Citadel.one runs active validator nodes on multiple networks so you can stake and earn rewards easily. Use the Сitadel.one staking platform or delegate your assets to our address via any preferred service. Multiple cryptocurrencies and dozens of addresses? We aggregate all relevant information about your assets for effortless monitoring and analysis in one place. Notifications about your claimable rewards, non-delegated assets, and unstaking periods.
Learn more
Kopano
We provide you with your digitally sovereign solution to keep track of your e-mails and calendars, to organize yourself with tasks or to stay in contact with team colleagues via video meeting. Kopano Groupware is an e-mail and calendaring solution, which can be operated digitally sovereign. Its functionality is comparable to that of Microsoft Outlook and Exchange. Kopano Groupware installations can be operated with more than 100,000 users. Kopano Groupware is an e-mail and calendar server that provides users with their daily communication and organizational data on all devices and connects teams. Data can be jointly edited in public folders or shared with others from your own inbox.
Learn more
Citadel Team
As easy to use as your personal communication apps, Citadel Team is compatible on all your terminals and offers all the standard features of instant communication. Operated by Thales and hosted in France, Citadel Team offers a high level of security and guarantees a model without data resell. Activated when necessary, with the end-to-end encryption option, only your devices can read your conversations. Deploy, control and manage your corporate fleet from the Citadel Team administration console, while guaranteeing the identity of your users via their professional e-mail. Increased team reactivity, centralized conversations and file sharing in private or public personalized spaces for your projects. Boost communication by inviting thousands of members in dedicated chat rooms! Citadel Team also allows you to discuss privately with each of your internal collaborators and invite external partners.
Learn more
Horde
Horde is the most flexible groupware on the planet, and that makes it the perfect platform on which to build your business productivity software. Horde connects to (and officially supports) more backends (all the leading SQL, LDAP, IMAP, Sieve, SMTP, cache platforms available today) than any other open source groupware system. This means you can continue to use your existing userbase and your users do not have to remember any additional passwords. Horde's feature set rivals the largest enterprise email systems. We have an incredible feature set that compares favorably against any competition in our primary apps (mail, calendar, address book), and even more in our secondary apps (time tracking, wiki, ticketing, and more).
Learn more
Pricing
Starting Price:
Free
Free Version:
Free Version available.
Integrations
Company Information
Citadel
www.citadel.org
Videos and Screen Captures
Other Useful Business Software
Build Securely on AWS with Proven Frameworks
Moving to the cloud brings new challenges. How can you manage a larger attack surface while ensuring great network performance? Turn to Fortinet’s Tested Reference Architectures, blueprints for designing and securing cloud environments built by cybersecurity experts. Learn more and explore use cases in this white paper.
Product Details
Platforms Supported
Linux
Training
Documentation
Support
Online
