The FindmySoft link: http://monocalendar.findmysoft.com/ WOT gave that site a terrible rating; correct, or overkill (not unknown with WOT)? (see attachment in previous post)
Oh, sorry, as I said, "I was tidying up my archives of trialled software". I hadn't actually downloaded it from the the FindmySoft link - just cribbed the notes as posted above. I'm unsure where I originally downloaded it from - it was quite some time back - but out of interest I fired it up just now and it seems to work OK - no Candyware or anything nasty like that.
In the MonoCalendar notes above, there is an embedded link that I had not copied across (I've updated it now), to a demo: Demonstration
That resolves to: http://monocalendar....ourceforge.net/demo/
It's quite a good demo, made using Wink. Watching it just now made me realise that MonoCalendar seemed like it could be an ideal fit for requirements similar to those referred to in this discussion thread, but a "suck-it-and-see" approach is what I would recommend.
I would suggest that the required functionality of the software is the issue rather than the quality of any given download site, but for greater peace of mind you could do a search on "MonoCalendar download" in DuckDuckGo and you'd get a page of relevant hits (as I did just now), so go for it if you'd like to find out more about MonoCalendar or even (say) try it out.