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Don’t get stung :-) Here are some of my favourite tools for web perf and analytics:

Monitoring

Uptimerobot.com - Free tier. 50 monitors. Sends a request every 5 minutes to a website.

Pingdom.com - Free tier. Gives average response times.

Azure Application Insights

Infrastructure

Builtwith.com - eg is this a wordpress site, what webserver etc..

Deadlinkchecker.com This handles redirects well

Command line tools

Curl

Performance

Apache benchmarks load testing from the command line

JMeter and this video was a useful 10 minute guide.

YSlow for testing webpages as a browser plugin

Lighthouse Chrome extension

Webpagetest.org - scores on perf, compression, caching, CDN

Security

SSL Labs I found an incomplete SSL Cert security chain using

SecurityHeaders.com and Scott Hanselman post on this

OWASP Zed Attach Proxy (ZAP) pen testing tool for finding vulnerabilities in web apps. I’ve only briefly used this and it pointed to the same issues as SecurityHeaders.com above.

Web Accessibility

Guidelines

Lighthouse Chrome extension