Plato Science. It's geared to 6th-9th grade, and it has been a big hit for DS8. He loves it!
I just have to make sure that he remembers to turn on the words on the screen and not just try to listen. He has to see the words or he replays it over and over and over. He doesn't mind, but it drives me INSANE and it makes him take forever to get done. The words on the screen fix that.
Otherwise, we bought Descartes' Cove for math, and he uses that from time to time. (Not online, but on the computer.) We also use bits and pieces like
www.freerice.org and a free geography game (the address is on the other computer, so I don't have that right now, but can find it this weekend if you want it).
That's it. Most of our stuff is from books, with some--mainly math and grammar--from workbooks.
