Photographer Brad Matthews recommends Topaz Photo AI 

Download a totally free trial of Topaz Photo AI: topaz.ai/photo-ai
"Whether it’s removing extreme noise from shots that were taken in low light, or correcting misfocus or camera shake, the results are just mind blowing. It’s so easy to use and so effective. Every photographer should have Topaz Photo AI in their editing toolkit."
- Brad Matthews, Photographer