Just thought I'd weigh in with MHO. It seems to me that it comes down to picking two of the following: 1. Portable GUI library 2. Rich widget set 3. Native look and feel Sometimes you can make a pretty good stab at the third, but it's not possible to do a good job on all three simultaneously. It's just a question of what you want to compromise. We have examples of each combination: 1 & 2: Gtk, Qt, wxWindows, Tcl/Tk 1 & 3: ObjectIO, ? 2 & 3: MFC, Gtk & Qt (On X11 only) Personally I'd use the 2&3 libraries, and rewrite my GUI for each platform. For building quick portable prototypes, I'd appreciate a library that falls into the 1&3 category too, but I won't expect it to be as full-featured or native-looking as a 2&3 library. Cheers, Simon