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Helicon Filter
WindowsAlternatives

A general purpose image correcting suite includes an excellent noise reduction filter.

 reduce-photo-noise, edit-photo, edit-image, process-image    Photos & Graphics, Photo Noise Reduction    Free (Limited features)
Editor Rating:
4.5
NDNoise
Linux, Mac OS, WindowsAlternatives

Java-based freeware for serious users to adventure into the world of noise reduction software.

 reduce-photo-noise, edit-photo, edit-image, process-image    Photos & Graphics, Photo Noise Reduction    Free
Editor Rating:
3.5
Noiseware Community Edition
WindowsAlternatives

A noise suppression tool to reduce noise from photos with simple choices.

 reduce-photo-noise, edit-photo, edit-image, process-image    Photos & Graphics, Photo Noise Reduction    Free (Limited features)
Editor Rating:
4.5