Cheat Engine for a memory scanner, which will scan the variables used in the game and it allows you to modify them as per your wish.
CheatEngine is available in both Windows and Mac OS Operating system.
Cheats engine is for educational purposes only. Before you attach Engine Cheats to a process, please make sure that you are not violating the EULA/TOS of the specific game/application. cheatengine.org does not condone the illegal use of Cheat Engine cheats.