Bilateral filter - an effect plug-in for Paint.NET
Bilateral filter is an image improving technique which is capable of edge preserving blur. It can be effective in removing noise and image artifacts while saving details. Also it may provide good looking artistic effects.
More details on the filter and it's parameters can be found here.
Installation
Paint.NET can be downloaded here.
After the effect DLLs are in place you'll be able to access it under Effects -> Blurs -> Bilateral:
Information on the filter
Please navigate the following link in order to find details on filter parameters and sample outputs.