Share Bootstrap
Share bootstrap offers great free themes and templates built with Bootstrap. It is an especially great resource for Dashboard templates and themes.
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A collection of 80+ free one page website templates. These free templates are great to quickly test your ideas before committing to a big project development.

Webflow Templates
Free website templates for designers, businesses, and personal use. You can browse free business, portfolio, and blog HTML5 responsive website templates for Webflow.

Templated
Templated is a collection of over 800+ simple CSS, HTML5 & responsive website templates, built and released for free under the Creative Commons.