So many countries have addresses where you can mail letters to Santa so that the child will receive a reply. If you search, you will also find plenty of inspired help to make reply letters yourself complete with stamps. Computers can do everything! On goodtoknow there is a template children can use to write to Santa with the address to send it to. You can write a letter online too at aletter4santa. There’s a small fee paid app called Letters to Santa Claus and if you are looking for other Santa apps, free or not, there are recommendations here on appolicious.