Citadel
Is a collaboration suite (messaging and groupware).
Citadel Alternatives [Page 2]
The best Citadel alternatives based on verified products, community votes, reviews and other factors.
Latest update:
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hMailServer is a free e-mail server for Microsoft Windows.
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The leading enterprise-class agentless device security platform to address the new threat landscape of unmanaged and IoT devices.
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We believe data protection should make running your business easier, not harder. Safetica protects companies against insider threats, offers data loss protection, and supports regulatory compliance.
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Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.
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Horde Groupware is a free, enterprise ready, browser based collaboration suite.
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An open source mailserver suite.
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Web-based IMAP email client
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Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
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IoT Security
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SOGo is groupware server with a focus on scalability and open standards.
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IoT Security
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Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.
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PowerMTA is an industrial-strength software for high-volume email delivery.
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Kontakt provides beacons infrastructure solutions and services.
