Computers for Hemiplegia and speech difficulties

My son is going into year 3 of mainstream school. He has right sided hemiplegia and cannot write well with his left hand. He also does not pronounce his words properly. His teachers want to get him the best computer/computer program to help him keep up with the work load. Does anybody know of any good programs that might be suitable. I know there are some voice activated ones but as his speech isn't great that would not be good for him. We have already used Clicker. Any more ideas would be really appreciated. Thanks.