I was searching for lightweight collaboration suite (messaging and groupware) to manage some small websites and while searching around I found Citadel.
Citadel is a complete and feature-rich open source groupware platform.
- Email, calendaring/scheduling, address books
- Bulletin boards, mailing list server, instant messaging
- Multiple domain support
- An intuitive, attractive AJAX-style web interface
The Citadel system is extremely versatile. It provides numerous front ends to present to users, such as a text-based interface, an AJAX-style web interface, and many popular PIM clients using SMTP/POP/IMAP. All of these can be used simultaneously.
It’s also extremely scalable. Not only can a well-equipped Citadel server support a large number of concurrent users, but you can also build a distributed network of Citadel nodes that share rooms and their content.
Let’s see how to install and configure it on a Debian 7 “wheezy”, most of this guide it’s based on the great linode guide wrote for debian 6.