My DS8 3rd grade(PG (with average PSI) & ADHD)enjoys Archademic Skill Builders (you may need a log in because he does it at school too) because they have some games that are not timed.

A few media tools that we have used are a multiplication CD that puts the times table to 10 to music and there is also an old school house rock video that he really enjoyed.

Another accomodation that we have used that has been very successful has been to incorporate movement into the practice. For instance,DS and DH would be playing catch with the football, I (or DH if I am not around) call out the problem, DS runs out for a pass, answers the problem and gets the pass. He absolutely loves tthis type of learning (actually they both do).