MAMP Pro 4.2.1 | Mac OS X | 350 MB.
Mamp: Create a local server easily.
Mamp is an application that will allow us to set up our own local server. Quickly and easily we will have Apache, MySQL and PHP.
A real advantage to develop our own web applications and test them , test our websites or if you want to make changes to the template of your blog and see how it looks before applying it to your site.