I used to use KeyNote also but I didn't really care for the underlying RTF storage format especially when it came to images... and the program had some other limitations.
I think my other comment got lost. I use OneNote and UltraRecall now.
I used to use Macropool ContentSaver (now known as WebRecall) and gladly bought a license, but I didn't upgrade when their browser extensions quit working in newer browsers without paying to upgrade. I had also moved on because of breaking changes to the underlying storage/functionality.
http://www.tranglos.com/free/keynote.html