Our team currently works on a Mac version of Neat Image (after so many requests from the users). This work will take at least two months I think, though there may be surprises from our team members like completing the job sooner.
If you need any beta testers, please let me know. I'm currently a registered user of the Windows version and have recently made "the switch"! Decent noise reduction software is the only thing that I'm waiting on to complete my workflow on the Mac.