It is illegal to download RPG Maker XP for free, but there is a working keygen floating around. I can't list any sites for you, but you could try searching that thing that begins with www.goo and...
I have a perfect one for you, it is called Engine001, a simple to use Action/RPG maker. It is 100% free and very easy to use. It uses a drag/drop scripting system. Comes with tons of awesome...