When you upgrade to the Starter, CMS, or Business plan, you will be able to link with the following external services.
Google Tag Manager
Google Analytics
Google Search Console
Channel
Intercom
Facebook Pixel (for Facebook ads)
Google reCAPTCHA v3
HubSpot Tracking(Beta)
You can set the linkage in the "Apps" menu from the dashboard.
This "External APPs Linkage" is only available in the paid plan, but if you want to embed external web services such as Google maps, formrun, SlideShare, etc. into your public website, you can use it even with the Free plan using an iframe box. For more details, please check here.
GTA GA Google Tag Manager Google Search Console Google reCAPTCHA HubSpot