Bootstrap is a widely used front-end framework with a wide range of themes and templates to choose from. Here are some popular free Bootstrap themes:
Bootswatch: Bootswatch offers a collection of beautiful free Bootstrap themes that support multiple colors and styles. You can easily apply them to your projects.
Start Bootstrap: Start Bootstrap provides many free Bootstrap themes and templates, including Landing Page, Blog, Portfolio, etc., all with responsive design and a modern look.
Material Design for Bootstrap: This theme combines Google Material Design and the Bootstrap framework, offering a modern and visually appealing design with multiple colors and styles.
Bootstrapmade: Bootstrapmade offers some high-quality free Bootstrap themes and templates for various purposes, including corporate websites, personal websites, e-commerce, etc.
Creative Tim: Creative Tim offers some modern Bootstrap themes and templates, including Admin Dashboard, Landing Page, E-commerce, etc.
Below are the official websites for these free Bootstrap themes and templates: