Here's a second for PTLens. I've used it extensively with my FZ50/DMW-LW55 wide adaptor, for which PTLens has a profile that works great. These files have all been shot with that combination and corrected in PTLens..
If you are looking for something to work with a relatively new camera, there's always the possibility there's not yet been a profile created for it, so I'd scan the data base, there is one for fixed and interchangeable lens cameras, to see what models and lens combinations are included.