gtmetrix.com
GTmetrix checks page speed, performance, technical issues, and web quality signals.
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merklemap.com
Discover and enumerate all subdomains associated with a website, including those not publicly advertised. Works by ingesting certificate transparency
tools.pingdom.com
Pingdom checks page speed, performance, technical issues, and web quality signals.
publicwww.com
Search engine for finding source code, tracking scripts, HTML snippets, and website technologies.