I use a double stochastic which is a stochastic of a stochastic, off the shelf stock Ninja. I use it to filter signals and as a signal if I get divergences across time frames. I've used others similarity, including custom MACD and Sto. For my purposes it's not as important what as how.
Incidentally, knowing what others use is not likely to do you a bit of good without your doing your own observation, study and testing. My derivative tools are an adjunct of observing and understanding price action and not a substitute.