The upgraded ai denoise tool is getting some good reviews. always nice with some free software. best used with linear stretching.
https://www.graxpert.com/
some videos giving it a go
https://www.youtube.com/watch?v=kmIfX6LaQrk
https://www.youtube.com/watch?v=JFaSjotPuRU
https://www.youtube.com/watch?v=OmHBvWwU6zE
can be added to pixinsight or standalone - windoze, mac and linux.
cheers
russ