"Co-author Timo Betcke and I wanted to release an open-source software package that implemented our solution methods for wave scattering. The means solving for the way light and sound waves bounce of various geometries of objects. We wanted it to be easy to use, with interesting problems solvable with just a few lines of code. The framework has been a useful way to release codes that go along with my research papers. Other researchers have contributed their own bug fixes, extensions, and examples, eg the scattering from the Happy New Year message on the front page."