Est. monthly visits
10K
| Web Servers & Operating Systems | |
| Apache HTTP Server Long-established open-source web server software | 67.2M sites |
| other | |
| ACME/Let's Encrypt Free TLS certificates issued automatically over the ACME protocol | 11.7M sites |
| FrontPage Legacy Microsoft web authoring tool for building sites | 253.5K sites |
| Supreme-Servers | 130 sites |
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