I am working on an open source academic project in c++. It will be used by a large community of scientific users. I need to develop a GUI in c++ that will be able to work on Linux/Unix, Mac and windows. Can anyone suggest a GUI development library that I could use? The application I am working on is not commercial, and it is provided open source. So, I need to use a library that I can use for free.
Thanks in advance for your help