This FLASH application generatres random numbers between a range that you select. Numbers can be re-used or always unique. The software includes the Mac version and the PC version. It also includes the swf file that is easily inserted into Interactive Whiteboard Software.
I use this in almost every class - not just for Math, but also to allocate activities, randomly select students and so on. The software will work from a memory stick and so can easily be moved between different computers.