Icinga Web is the web interface for Icinga. Although a lot of the features of Icinga are better used via command line, this cumulates most of the day to day functionality in a user friendly graphical interface, that even non technical people can use.
The central part of Icinga Web is the monitoring module, which had to be completely rewritten to work with the highly anticipated Icinga DB, which is the new database interface for the Icinga core. This was the chance for a fresh UI redesign.
For the first version we wanted the new UI to be more consistent, visually clearer and provide more viewing options.