Staticman can be used to integrate user-generated content into a static site.
You may also be interested in ...
Tailwind CSS Components
A free repository for community components using TailwindCSS. Open source Tailwind UI components and templates to bootstrap your new apps, projects or landing sites!
Numverify
NumVerify offers a full-featured yet simple RESTful JSON API for national and international phone number validation and information lookup for a total of 232 countries around the world.
How display:content works
Ire Aderinokun, Frontend Developer and User Interface Designer, explains in this post how display:content really works.