You will find some nice extras under GVB Fun. It might be a competition where you can win something, or games such as coloring or memory for the little ones.
The GVB screen saver – a rotating list of trams and buses departing from Central Station with ferries in the background –
available here free download. (It is a zip file.)
The fun part about the screen saver is that it shows Amsterdam day and night depending on the time of day. The PID's (passenger information displays) show the time given on your computer.
For the enthusiast not afraid of a little programming, you can add your own trams and buses.
Once installation is completed, you will find instructions in the GVBdata folder on your C: drive.