If you're not yet using reaper I highly advise you to try it out. I run it on debian and it works extremely well. For noise reduction you can use reafir which is one of the built in plugins of reaper. Here is a link with basic tutorial on how to do noise reduction with it.
https://www.homebrewaudio.com/9603/reafir-madness-hidden-noise-reduction-tool-in-reaper/
Dangerous Dave on DOS, must have been in the early 90ies somewhere. https://en.m.wikipedia.org/wiki/Dangerous_Dave