Not sure if this exactly what you are looking for but a site I like to use with my kids is aplusmath.com also, superkids.com has games and also a worksheet generator that the kids could print the worksheets, complete them, and bring them in.
oh one more...check out thatquiz.org I haven't used it in a couple years but when I taught sped I would use it to PM my caseload students on their goals. I really liked that site.
ps...if your school has money you could do math facts in a flash. it is part of accelerated math and there is a home connect version for the math facts in a flash. it records the students' scores and tells you the last time they logged in, etc.