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| Mailgun Transactional email API service for sending and tracking mail | 1.5M sites |
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| netcup German provider of servers and web hosting | 1.1M sites |
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| HSTS HTTP header forcing browsers to use secure HTTPS connections | 122.9M sites |
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| Caddy Web server with automatic HTTPS and simple configuration | 3.7M sites |
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| Go Compiled programming language used for backend services | 3.9M sites |
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| Bootstrap Popular CSS and component framework for responsive layouts | 37.9M sites |
| MUI React UI component library based on Material Design. | 394.2K sites |
| Material UI React component library implementing Google's Material Design. | 486.9K sites |
| React JavaScript library for building component-based user interfaces | 23.2M sites |
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| jQuery Widely used JavaScript library simplifying DOM manipulation, events, and AJAX | 92.3M sites |
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| Font Awesome Popular icon library and toolkit for scalable web icons | 57.4M sites |
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