Much like Moom extends functionality of the NSWindow’s close/open/minimise across applications. Is there access to the API’s for OSX’s spelling system?
To be more specific… is it possible to hook into an systemwide event for when there is a spelling mistake?
Edit
I am guess if there was it would be through the Accessibility APIs…
You can use NSSpellChecker for this purpose. Or if you want to just add regular spellckecking, You can enable spell-check for most of the text input fields.