Citadel is a classic groupware platform that bundles email, calendars, contacts, forums, and shared resources into a single server. It targets teams that want a self-hosted collaboration hub with messaging and scheduling built in. Citadel has a long history in the open-source community and is commonly deployed on Linux servers as an all-in-one communications stack. It is lightweight compared to enterprise suites and fits well for small organizations or internal collaboration.
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