Here’s a download of one of my earlier apps Hog Bay Notebook then renamed to Mori. I sold Mori to another developer maybe 10 years back. It hasn’t been updated for a long long time and from what I can tell it’s discontinued. I get a few requests each year for a download link.
Here’s the last version that I have:
https://s3.amazonaws.com/morinotebook/Mori.zip
This is the normal public download. It will ask for a license key. But I think if you just keep clicking “Later” it should continue to work. I don’t recommend using this app for real work. It won’t be updated again and is likely buggy on newer versions of macOS. The basics seem to work on macOS 10.13, but I’m sure there are bugs I haven’t noticed.