Hi,
I am trying to find a program to intercept network and reply on the fly. I have found different programs for this purpose but they didn't work properly for software that doesn't use proxies. Below are the list of programs that I have tried

FakeNet
It runs but cannot reply
Fiddler2
It runs and hooks internet explorer or firefox but not every program
BurpSuite
Same as above

I am using Windows 7 x64

Why not just write your own code to hook send(...)/recv(...) in the target process?