I have been using GIMP for couple of years. And never even thought that it was written in C. It supports multiple operating system. It is simple and user friendly (those didn't use please do not comment). But the fact is not only qt or other memory hungry languages, it is possible to create multi platform FDM like gimp did.

All the geeky people out there i have this challenge if you are thinking you are smart then generate a full features FDM 6.x in C as gimp has been built and PM me.