Calendly

Calendly is a booking and scheduling tool that handles meeting arrangements for you. It is built by the company of the same name, which has become practically synonymous with online booking. It suits freelancers, consultants, salespeople and whole teams who want the other side to pick an open slot themselves.

It works simply: you connect your calendar, set when you are available and how long the meeting should be, and get a link to send to your client. They see only your genuinely free slots, pick a time, and Calendly automatically creates the event in both calendars along with a confirmation email.