Do you ever need a way of choosing a random student or perhaps a timer to display on the IWB? There are various free resources available to help!
This random name selector by John Mclear on Primary Technology will randomly select a name from a list you can easily input. Once you have input a list of names you can then save the list as a link. It is possible to remove a name from the list once it has been chosen.
You can save a list of names so have easy access to lists of all your classes by just having the link somewhere easy to access.