MAMP PRO for Mac

From living-e AG:

"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. As a professional web developer you have to test your programs in detail. In addition, you need a highly configurable developing environment with all the components also used by most ISPs: Apache, MySQL and PHP in the latest stable versions. No matter whether you want to test your latest Ajax creation, or realize a new page with a Content Management System (CMS): MAMP PRO supports you during the tests of your developments. You can set up any number of servers to carry out tests without danger for your live system. Besides, the local name resolution is performed by MAMP PRO. To simulate a very authentic environment, the MAMP PRO also switches on the local mail server, so that dispatching mails by PHP scripts is possible. With MAMP PRO, you can easily connect your local server with an existing Dynamic DNS provider, as for example dyndns.com. Making it very simple to quickly make the results of your work accessible externally for superiors and prospective customers. And because you can set up many virtual hosts, you can easily offer alternative configurations or suggestions.