Part of the Citadel system is WebCit, a rich web-based front end to the system. This screenshot shows a public folder or message board being viewed in WebCit.
WebCit has a convenient “summary” view, bringing together important information on one screen in real time.
KDE Kontactis easy to connect to Citadel using GroupDAV. Here we see a Citadel address book being viewed in Kontact.
Microsoft Outlook can connect to Citadel's email and public folder services using Microsoft IMAP, or it can connect fully to email, public folders, calendars, contacts, tasks, etc. using the Bynari Connector product.
Citadel is groupware with BBS roots, so it's no surprise that Citadel still offers a traditional text-based BBS front end. This screenshot shows a listing of all the rooms on a Citadel site.