CBS has most of their shows free online now. I used yourtvseri.es which became yourtvsho.ws for ages, but it is basically worthless now. I've noticed I generally have to find one on a case by case basis, because all the big guys keep going down.
Many of these tend to be barred from use abroad tho.
For example, the official South Park site, afaik, streams SP for free, but I can't watch it from here. I have to use that Indonesian based site, I think it is
The Norwegian state channel NRK put almost everything they ever show online. I had no idea how expansive their online library was, untill just recently :I