My MSc thesis work in Computer Science involves developing a software solution for a particular problem for which already exist several solutions, in particular commercial software. I know I can't ignore them in my work and have to cite them, but I have no access to them, so I can't perform any comparisons to prove that my work will actually contribute to research in this field, rather than simply being another software program trying to deal with the problem.
What's the best approach in this case?