Resound is a modular sound editor and applications programming interface.
The idea of the program is to make it easier for researchers with a little programming ability to make their great sound editing ideas come to life without having to write out a full-blown application. This is accomplished by creating an environment where all a would-be programmer has to write is an add-in module object that communicates with the main program. Without modules, this program isn't too useful. With them, it shows a lot of potential, I think.
The program comes complete with source code, under the GNU license. Have fun!