MAMP - MAMP is the abbreviation for Macintosh, Apache, MySQL, and PHP. It is a reliable application with its four components that allows you to access the local PHP server as well as the database server (SQL).
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Apache HTTP Server - Apache httpd has been the most popular web server on the Internet since April 1996
TreeSize - TreeSize tells you where precious disk space has gone to.
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
SpaceSniffer - SpaceSniffer is a freeWare (donations are welcome) and portable tool application that lets you understand how folders and files are structured on your disks.