github.com
wayback-machine-downloader downloads websites, archived pages, or web source files for offline access and review.
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speed.cloudflare.com
Cloudflare speed test for checking download, upload, latency, jitter, and network quality.
cachedpages.com
Tool for checking cached versions of web pages from search engines and archive sources.
cachedview.com
CachedView checks Google cache, archive copies, and saved versions of a website.