I wrote about Geoboards the other day when discussing topology. I found this website when looking for a good picture of a Geoboard as well as a place to buy them. This website creates a “virtual” geoboard that children can manipulate. When you open it, a geoboard appears and you can click on the rubber bands and then put them on the pegs. You can drag them to create different shapes. On the side, there is a color palette so the children can choose which color they want for their shapes.
This site is a nice addition to actual geoboards, but I wouldn’t replace the real thing.