Spellchecking for QTextEdit on Mac OS X
Morten Sørvig at Trolltech has released a binding for the Mac spellcheck system, allowing it to be used in QTextEdit widgets on that platform only, which required the use of Objective-C to implement. It is available in this ZIP file from the Trolltech site. The code is under the GPL, and may be released with the next version of Qt Solutions for commercial Qt developers.