Noise, Grain, Artifact Reduction Tools
The About Graphics Software website has a handy list of software applications that all claim to be able to effectively remove noise from digital photos or to reduce or removing artifacts from too much JPEG compression. Some of the names are familiar - Noise Ninja, Neat Image - some of them aren’t, but if you’re wondering which one to try first, the last link on the page is to Michael Almond’s Noise Reduction Tool Comparison. Michael has compared no less than 18 different software packages so that you don’t have to.
Website: About Graphics Software - Noise, Grain, Artifact Reduction Tools