Free calendar scheduling tool

I've used and recommended different online scheduling tools through the years, and I've come across one that I especially like. It's called Calendly, and it interfaces beautifully with Gmail and my Google calendar.  It even interfaces with my calendar on my MacBook Pro laptop. At first, I bought the year-long subscription, and segmented all of my appointments. There's color-coding (which I just love), and there are welcome and reminder emails, which are so helpful! You can set up time between appointments, so they don't end up back to back. And last but not least, you can black-out how many days before an appointment can be set. No surprise last-minute appointments will show up on your calendar. :) What I noticed [...]