A thermostat that helps you save energy?
Quby's Toon does just that. And just as this little rascal saves the environment and your hard-earned money in the process, Qt also helped Quby reduce 30% of their memory usage making their application perform better and reduce start-up time.  They also save tons of development time during their process of localizing and internationalizing their applications to new markets thanks to the Qt Virtual Keyboard and Qt Linguist. Watch the video.