http://www.mediafire.com/file/md2c4us6gh2ojmu/FE1_Nightmare_Modules.zip
There's a bunch of stuff there. Character editors, item editors, the like.
A year and a half later EDIT: http://feuniverse.us/t/fe1-nightmare-modules-hey-we-can-edit-growths-now/1205 Here's said link on FEU. If I get back into FE1, that's where the most up-to-date download will be.