gtmetrix.com
GTmetrix checks page speed, performance, technical issues, and web quality signals.
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tools.pingdom.com
Pingdom checks page speed, performance, technical issues, and web quality signals.
radar.cloudflare.com
Cloudflare Radar is a unified search tool for finding web pages, files, records, code, or internet intelligence.
github.com
wayback-machine-downloader downloads websites, archived pages, or web source files for offline access and review.
wikipedia.org
Wiki Engine List is a Wikipedia reference page for background information, comparisons, and linked sources.