Of the features of California should be noted modern and easy interface, simplified the configuration process, output support event notifications to your desktop, and use for data access calendar planner.
The design of California based on the current set of widgets, GTK and design of GNOME 3, including the use of GtkHeaderBar for placing controls in the window title.
Installation into Linux:
sudo add-apt-repository ppa:yorba/daily-builds sudo apt update sudo apt install california
sudo add-apt-repository -r ppa:yorba/daily-builds sudo apt update sudo apt remove --purge california