Can't think of anything... not sure you need a programme though.
Maths based games / play should be sufficient.
For example, toy money - just count the coins rather than their value initially.
Magnetic numbers - if he likes playing with letters on the fridge, get a numbers set as well. Wooden Magnetic Numbers
Counting everyday objects - stones, pinecones, dried pasta.
Sharing (division) - such as sharing sweets between teddies, or other children.
Number Worksheets - BBC Schools NumberTime
Number Flashcards
Number Rhymes - Counting - such as Five little speckled frogs, One potato two potato, 5 current buns in a bakers shop.
Numberjacks Online games
Going shopping - ask him to pick 3 bananas, 2 oranges, that sort of thing.