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strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Smaller - Make your websites load faster
ftrace - A function tracer for the Linux kernel.
Website Grader - Grade your website's strengths and weaknesses in seconds.
perf - Perf is a simple app monitoring solution paired with meaningful alerts.
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.