What are some alternatives?
When comparing TreeSize and MAMP, you can also consider the following products
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
XAMPP - XAMPP is a free and open-source cross-platform web server that is primarily used when locally developing web applications.
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
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.
Microsoft IIS - Internet Information Services is a web server for Microsoft Windows