K5 Learning has an online reading and math program for kindergarten to grade 5 students. I've been given a 6 week free trial to test and write a review of their program. If you are a blogger, you may want to check out their open invitation to write an online learning review of their program.
I think this could be quite good for my slightly older ones who could do with extra work on their maths. I will get back to you with a review when I am finished my trial.
Honestly this is the first time I have ever reviewed anything, but hey, might as well give it a try.