I found this while searching for Isometric map images, its actually not bad and does have an isometric object building tool. http://www.explore-rpg.com/ It makes Diablo 2 or Sacred style rpg games i tried a map i'm working on as a test, looked funny since it was a continental map but it seems like a fun program for 25 bucks. The basic license is 25 dollars, the MMOG is 50