About
Citadel/UX is a collaboration suite that provides email, calendaring, address books, and mailing lists. It's designed for small to medium-sized organizations and offers a web-based interface.
Pricing
Pricing Type
Open Source
Free tier available
Billing
One-time payment
Last checked: February 17, 2026
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Key Facts
Categories
Platforms
Web
Company
Citadel Team
Founded
Founded in 1988
Country
Global
Language
English