Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
ftrace - A function tracer for the Linux kernel.
LiteSpeed Web Server - LiteSpeed Web Server (LSWS) is a high-performance Apache drop-in replacement.
Valgrind - Valgrind is an instrumentation framework for building dynamic analysis tools.