You could have downloaded Dfine2 2.0 for Mac from our software library for free. Our built-in antivirus scanned this Mac download and rated it as virus free. The application is included in Design & Photo Tools. The actual developer of this Mac application is Nik Software.
From the developer:
Dfine gives you unprecedented control over exactly how much and where to apply noise reduction. This makes it ultra-easy to eliminate noise in your images while maintaining detail and sharpness, thus improving the quality of every digital photo you take. Dfine 2.0 is designed to prevent the loss of detail other noise reduction tools often introduce.
You may want to check out more software for Mac, such as MacOSaiX, Sweet Home 3D or Delicious Library 2, which might be similar to Dfine2.