10,000,000 game Cheat Engine hack (resource hack) http://www.youtube.com/watch?v=231xw9EY-l4 Download Cheat Engine 6.2: http://www.xpgamesaves.com/forum/462-pc-cheat-engine-hacks/
it works for many online games, I have used it on some facebook games in the past such as candy crush saga however some games will ignore your changes and revert when you reload the game. I have not tried it on wartune though so it's just a case of trial and error + luck to make the changes stick.
It doesn't work on Wartune. Now while you can get find the gold value you cant change it due to the whole client/server deal.