Zapier (https://zapier.com/) is a service that connects two web apps to work together.
At Coworkify, we use Zapier to send our data to external web apps. For example, we send an event data to your Google Calendar whenever there is new booking made in our calendar. As a result, your Google Calendar and our calendar will be in sync.
Zapier is free for the most usage. Please refer to Zapier website for details.