| CMS & Website Builders | |
| WordPress Open-source CMS powering websites, blogs, and content management | 75.7M sites |
| WordPress Multisite WordPress feature running multiple sites from one installation | 1.4M sites |
| Business Email & Productivity | |
| Fastmail Hosted email provider with calendar and contacts for businesses. | 238.2K sites |
| Hosting & Cloud Providers | |
| DigitalOcean Cloud hosting provider offering virtual servers and services | 2.3M sites |
| Security & Bot Defense | |
| HSTS HTTP header forcing browsers to use secure HTTPS connections | 131.7M sites |
| Keybase Encrypted messaging and identity verification service. | 29.1K sites |
| Web Servers & Operating Systems | |
| Nginx High-performance web server and reverse proxy widely deployed | 153.2M sites |
| Ubuntu Popular Linux operating system used for servers | 18M sites |
| Languages & Back-End Frameworks | |
| PHP Server-side scripting language powering a large share of websites | 114.2M sites |
| JavaScript Libraries & Widgets | |
| imagesLoaded JavaScript utility detecting when page images have finished loading | 11M sites |
| jQuery Widely used JavaScript library simplifying DOM manipulation, events, and AJAX | 114.7M sites |
| jQuery Migrate Compatibility shim restoring deprecated jQuery APIs for older code | 53M sites |
| Databases & Caching | |
| MySQL Popular open-source relational database used by many web applications | 77.9M sites |
| Performance & Optimization | |
| W3 Total Cache WordPress caching plugin improving site speed and performance | 1.3M sites |
| SEO & Content Discovery | |
| RSS Web feed format syndicating site content for readers and aggregators | 71.1M sites |
| Fonts & Icons | |
| Google Font API Google service delivering free web fonts to websites | 105.7M sites |
| Jetpack – WP Security, Backup, Speed, & Growth Security & Privacy | 5.1M sites |
| Akismet Anti-spam: Spam Protection Social & Community | 4M sites |
| Wpcom | 2.2M sites |
| My Jetpack | 2.1M sites |
| Jetpack Boost – Website Speed, Performance and Critical CSS Performance & Speed | 2.1M sites |
| ActivityPub Other | 5.9K sites |
| Press This Content & Media | 2.7K sites |
| Webmention Other | 876 sites |
| Friends Content & Media | 848 sites |
| IndieAuth Security & Privacy | 403 sites |
| Micropub Other | 218 sites |
| Parse This | 138 sites |
| Post Kinds | 129 sites |
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