Here are some free bootstrap themes to download.
Creative is a one page Bootstrap theme for creatives, small businesses, and other multipurpose uses. The theme includes a number of rich features and plugins that you can use as a great boilerplate for your next Bootstrap based project!
Stylish Portfolio is a one page Bootstrap portfolio theme with off canvas navigation and smooth scrolling through content sections.
One Page Wonder
One Page Wonder is a Bootstrap 4 starter theme for quickly creating attractive one page websites in Bootstrap.
Clean blog is a carefully styled Bootstrap blog theme that is perfect for personal or company blogs. This theme features four HTML pages including a blog index, an about page, a sample post, and a contact page.
Agency is a stylish, one page Bootstrap theme for agencies and small businesses. The design of Agency is based off of the Golden PSD Theme by Mathavan Jaya. You can download the PSD verison of this theme at FreebiesXpress.com.