If there is one tool that saved me the most time and back-and-forth communication last year, it's Calendly. It makes the process of scheduling such a no brainer that it's amazing there was nothing like it before. They recently added an integration with Zoom which makes scheduling video calls even easier.
We use Calendly to schedule hiring interviews. You just share your Calendly link and people can pick a free time slot without any back and forth.
I connected it to my work calendar and refined my availabilities further in their settings, so I know I won't get a meeting at a bad time.
I wouldn't use it to set up meetings with coworkers though. It is just easier to use your work calendar and check their availabilities there.