TidyCal

I love this product. I've used the paid-for version of Calendly for years, which was ok but a bit clunky these days; then they put their prices up, so I cancelled. I needed an affordable booking solution with which I could also take payments. TidyCal was easy to set up, had no integration problems, and was up and running in 10 minutes - and all for a $ 39-lifetime payment! Amazing.