The abbreviation "MAMP" stands for: Macintosh, Apache, MySQL and PHP. With just a few mouse-clicks, you can install Apache, PHP and MySQL for Mac OS X!
What's MAMP PRO?
MAMP PRO is the commercial, professional grade version of the classic local server environment for Mac OS X: MAMP. Designed for professional web developers and programmers, MAMP PRO allows easy installation and administration of their development environment under Mac OS X.