Seems nice, but is not free

This seems like a great plug-in, but to be useful it is $10/month.
If you actually want a free calendar, you can’t use this. You must subscribe to their service. The “free” version doesn’t sync with your calendar which means users won’t be able to pick free or busy times.

I’m sure this is a great service, but I don’t want a service. I just want a calendar and I thought their description was not extremely honest as it took an install and 10 minutes to find out that I would need to pay $10-15/month to use their calendar widget.