Free HTML5 templates for responsive websites can be found on various resources. Here are a few popular platforms where you can download high-quality free templates for building responsive websites:

  1. Bootstrap

Bootstrap is one of the most popular frameworks for developing responsive websites. It provides free templates that can be used to build responsive websites. There are many templates on the official website for different needs (corporate websites, portfolios, blogs, etc.).

  1. HTML5 UP

HTML5 UP offers a wide range of free responsive templates built on HTML5 and CSS3 standards. All templates are open source, which allows you to edit them to your own needs.

  1. Templatemo

Templatemo has a large set of free HTML5 templates for responsive websites. They have a modern design and support mobile adaptation.

  1. Start Bootstrap

Start Bootstrap offers free Bootstrap templates that are ready to use and have a responsive design. They are ideal for creating websites with minimal time.

  1. Colorlib

Colorlib provides a large number of free HTML5 templates for responsive websites. Their templates are suitable for different types of projects, including business websites, portfolios, and blogs.

  1. W3Layouts

W3Layouts offers free templates for different types of websites, many of which are responsive. They provide a simple interface to download and use the templates.

These resources provide a variety of templates to quickly build responsive websites that automatically adjust to different screen sizes on mobile, tablet, and desktop.