Don't give up!
I have one for you: Notepad Clone with Spell Check out of the box.
Can you create an open source Notepad clone... and then just add an open source spell checker to it? In other words, a Notepad equivalent which would have red squiggly lines under your misspelled words so that you can just create universal .txt files quickly.
Hear me out before jumping to conclusions. I have been looking for that since Internet begun. Notepad++ can be set up that way but it is a *nightmare* to use.
You may think that there is a simple Notepad equivalent with spell checker out there, but there isn't. You would have to spend an hour or more figuring out how to modify it and then simple things like changing the display font would be (literally) impossible to find for an average user on it.
So make Notepad than can do this out of the box with Spellchecker already installed:
http://www.overclockers.com/forums/...epad-Review-Spell-Checker-for-Windows-Notepad