| Security & Bot Defense | |
| HSTS HTTP header forcing browsers to use secure HTTPS connections | 117.3M sites |
| Web Servers & Operating Systems | |
| Apache HTTP Server Long-established open-source web server software | 67.2M sites |
| Languages & Back-End Frameworks | |
| PHP Server-side scripting language powering a large share of websites | 89.1M sites |
| Front-End Frameworks & UI Toolkits | |
| Bootstrap Popular CSS and component framework for responsive layouts | 36.7M sites |
| JavaScript Libraries & Widgets | |
| Backbone.js JavaScript framework structuring apps with models and views | 571.9K sites |
| Clipboard.js Lightweight JavaScript library for copying text to clipboard | 995K sites |
| Handlebars JavaScript templating library generating HTML from templates | 302.2K sites |
| Underscore.js JavaScript utility library offering functional programming helpers | 4.8M sites |
| bowser JavaScript library for detecting browsers and their versions from user agents. | 43.9K sites |
| jQuery Widely used JavaScript library simplifying DOM manipulation, events, and AJAX | 90.4M sites |
| jQuery Migrate Compatibility shim restoring deprecated jQuery APIs for older code | 39.3M sites |
| jQuery UI jQuery-based library of UI widgets and interactions | 6.6M sites |
| other | |
| ownCloud Self-hosted file sync and sharing server | 1.8K sites |
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