Here’s an excellent resource for primary/elementary Maths from Glencoe/McGraw-Hill. It’s a flash-based set of interactive tools for reception up to year 8. It includes standard maths items, as well as graph paper and other backgrounds. It’s free, and well worth a look.
The tools also include basic IWB tools such as text, pen, a ruler/protractor and a timer. This would be quite handy for those without access to regularIWB software.
Access the resource here