break-time has two useful plugins:

• Google Calendar
  This is a plugin to make sure that break-time doesn't schedule a break when you have an event on your Google Calendar. You are required to authenticate with your Google account the first time you run break-time.
• X Window Title
  This is a plugin to make sure that break-time doesn't schedule a break when you have an X window open with a specific title. This is useful to make sure that a break doesn't occur when you are on a video chat (e.g. Zoom or Google Meet).