RPG Maker 2000 is a program that allows your average gamer to create his/her own RPG.
RPG Maker 2000 was created by Yoji Ojima and published by ASCII.
There is a large community formed around the illegal english translation of the program, being distributed by a man named Don Miguel. Many websites have been closed down by ASCII due to copyright infringement.
RPG Maker 2000 is recommended if you want to play around with making your own RPG, but be warned - it is illegal.