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