What's new in MAMP 4.0 for Mac?
MAMP 4 brings even more opportunities for web developers. We are now supporting MySQL 5.6 and Nginx is now fully integrated. Server starting times have been improved.

General
MAMP installs a local server environment in a matter of seconds on your computer. It comes free of charge, and is easily installed. MAMP will not compromise any existing Apache installation already running on your system. You can install Apache, PHP and MySQL without starting a script or having to change any configuration files! Furthermore, if MAMP is no longer needed, just delete the MAMP folder and everything returns to its original state (i.e. MAMP does not modify any of the "normal" system).

Licensing
Similar to a Linux-Distribution, MAMP is a combination of free software and thus it is offered free of charge. MAMP is released under the GNU General Public License and may thereby be distributed freely within the boundaries of this license. Please note: some of the included software is released using a different license. In these cases, the corresponding license applies.

Apache
Apache, the open source http web server is one of the primary parts of MAMP. Because of its modular structure, it can easily be enhanced with add ons. MAMP comes with over 70 Apache Modules such as PHP, SSL, Webdav, Auth, Cache and many more. Many ISPs use Apache, making MAMP the perfect tool for testing your websites locally before releasing them.

Nginx
Nginx is a web server. It can act as a reverse proxy server for HTTP, HTTPS, SMTP, POP3, and IMAP protocols, as well as a load balancer and an HTTP cache.

MySQL
A database is at the heart of every modern, dynamic website. MAMP comes with MySQL which is the most commonly used relational database system. There is a MySQL interface for nearly every programming and scripting language available. Thanks to MAMP you can easily develop complex MySQL database applications on your local PC and upload them afterwards on to your live system. For easy configuration MAMP PRO comes with phpMyAdmin.

PHP
81% (and growing) of all websites are using PHP as its server side programming language. This means PHP is the most commonly used programming language for creating websites. PHP is preinstalled by nearly every ISP. MAMP comes with 2 versions of PHP. You can switch between the versions in the settings. The most popular extensions such as XCache, Sqlite, Curl, Freetype and libxml come pre-installed with MAMP.

Requires OS X 10.10 or later

Home Page - https://www.mamp.info/en/