Website Template Sources (free / low-cost):

https://html5up.net/ – Very nice templates, modern, upbeat. Responsive. License: Creative Commons

https://templated.co/ – Very nice templates, modern, upbeat. Responsive. License: Creative Commons

https://w3layouts.com/free-responsive-html5-css3-website-templates/ – Modern, graphical, clean designs. Responsive. License: Creative Commons Attribution 3.0 Unported – fee to remove back link.

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Please be aware that most "free" website template sites cover their costs by displaying advertising. They also sell premium website templates on a paid basis. Be cautious when you download a template -- read the license granted with each template you download (including information on using the included images).