| Business Email & Productivity | |
| RoundCube Open-source browser-based webmail client for email access. | 847.7K sites |
| Web Servers & Operating Systems | |
| Apache HTTP Server Long-established open-source web server software | 82.9M sites |
| Languages & Back-End Frameworks | |
| PHP Server-side scripting language powering a large share of websites | 118.1M sites |
| Front-End Frameworks & UI Toolkits | |
| Bootstrap Popular CSS and component framework for responsive layouts | 45.6M sites |
| JavaScript Libraries & Widgets | |
| jQuery Widely used JavaScript library simplifying DOM manipulation, events, and AJAX | 118.1M sites |
| jQuery UI jQuery-based library of UI widgets and interactions | 8.1M sites |
| other | |
| Spec-As | 1 sites |
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