You can make ravioli the old-fashioned way with just a knife and water. But having tried it, I can safely share that it takes experience to do it properly. Hence, the many ravioli tools sold to home chefs to achieve the perfect stuffed pocket. The pan above is good and quite popular, but I prefer the presses below.
The rolling pin is rustic and not commonly found. It's fast but takes a bit of practice to line up the filling just right.
The easiest way to make ravioli is a pasta machine, preferably electric. I have one of these and you can whip up batches of ravioli real quick. Line up 2 pieces of pasta and plop the filling in the middle then crank that handle to churn out perfect parcels.