strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Website Grader - Grade your website's strengths and weaknesses in seconds.
perf - Perf is a simple app monitoring solution paired with meaningful alerts.
Smaller - Make your websites load faster
DTrace - DTrace is a performance analysis and troubleshooting tool for Solaris, Mac OS X and FreeBSD.
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.