So many people ask this question and when people start shouting programs, it leads to more questions than answers. I'd have to say that the "easiest" way to make money depends largely on the person. It will be easy if you enjoy what you're doing. On a mechanical level, though, the "easiest" way to make money is a method that:
One, does not have many steps to complete.
Two, can be or is automated, and
Three, does not require a lot of investment.
There are a few methods like that out there that are sort of "out of the box thinking" once you read them. You just have to look in the right places.