Act2 | Not just a theme but a powerful framework for your HubSpot website
HubX | Copy modules and groups between templates in the new HubSpot Design Tools
Coscopy | Copy drag-and-drop modules and groups in HubSpot old Design Manager
Most of the fonts in the Customization Tool are loaded from the Google Fonts directory. The other fonts are web safe fonts (e.g. Helvetica, Arial, etc).