Scenery Software

Can anyone point me in the right direction for some free software that will let me create or add buildings ect to an airport that i have created using AFCAD 4.1(thanks to the maker of that software for a brilliant and easy to use freebie)
I am at present using fs9 and there doesnt seem to be much out there yet?
thanks lots
I am at present using fs9 and there doesnt seem to be much out there yet?
thanks lots
