Citadel

Welcome to Citdel, where simplicity meets power. Citadel is an easy-to-install, open-source system that offers a range of services including email, collaboration, groupware, and content management. With Citadel, you can have all these features up and running in just minutes, whether on your own hardware or in the cloud.

Citadel's exclusive "rooms" based architecture makes it versatile and powerful, allowing you to seamlessly navigate through email, calendar/scheduling, address books, bulletin boards, instant messaging, and more. The platform also supports multiple domains and offers a robust web interface for easy access.

What sets Citadel apart is its commitment to being truly open source. The software is released under the GNU General Public License, ensuring that you have access to the best available features without any restrictions. Join our friendly community and experience the full potential of Citadel.