Gravity Forms does have a Template Library where you can demo and download and import the forms you want to use.
You can access these form templates in two places:
#1 From the Gravity Forms website:
You can demo and download the templates here: https://www.gravityforms.com/form-templates/
If you need help importing the templates into your site, please use this tutorial: https://docs.gravityforms.com/importing-a-form-into-gravity-forms/
#2 Within the Gravity Forms Plugin
In version 2.7, Gravity Forms has added a Template Browser to the form builder. You can not start building your forms using a prebuilt template. Watch this video to see it in action: