Use wxWindows (http://www.wxWindows.org).

It is crossplatform to GTK, Motif, Win32 and Mac.  It is native for C++
but also has python and perl implmenetations.

wxWindows has been very stable for me and is licensed under the LGPL(or a
slightly modified LGPL)

What is wxWindows?
wxWindows gives you a single, easy-to-use API for writing GUI applications
on multiple platforms. Link with the appropriate library for your platform
(Windows/Unix/Mac) and compiler (almost any popular C++ compiler), and
your application will adopt the look and feel appropriate to that
platform. On top of great GUI functionality, wxWindows gives you: online
help, network programming, streams, clipboard and drag and drop,
multithreading, image loading and saving in a variety of popular formats,
database support, HTML viewing and printing, and much much more. 

Derek Neighbors

On Tue, 5 Jun 2001, Stephen Smith wrote:

> Does anyone know of a C/C++ framework for TK.  I would like to work on a project that is graphical/portable in nature
> and since TK runs on Windoze and Linux it is the product of choice.
> 
> I know that GDB uses it, but am not sure how to do the same.  Can anyone help?
> 
> sps
> 
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