Yes, beano works. It helps reduce the amount of particular starch molecules, which bacteria love to chomp on to produce gas. Beano is an enzyme that cleaves these molecules, allowing you to absorb them rather than let the bacteria eat them.
Gas-X will not work for flatulence. All simethicone does is break up bubbles already in the system. It reduces their size, so they don’t stretch out the stomach or bowels so much. But you’ve still got as much swallowed air in the system.