easyphp & notepad++

If you're developing in PHP and need a web server MAMP is probably your best bet.

With that said, my personal approach is to install Homebrew and then install whichever packages I need from there. Of course, either way works.

Regarding text editors, it's a fiercely debated topic here I'd imagine but I'd recommend that you take a look at Atom - it's free and open source and has pretty good Git integration.

 

MAMP is not used in conjunction with Atom, per se. You code the site in Atom as you would in Notepad ++, and the site is served by MAMP.

Try watching this to get an idea of how to use MAMP

 

I agree completely with JoelTheSuperior. On the Mac MAMP or MAMP Pro (http://www.mamp.info/en/mamp-pro/) are by far the best way to instantly set us a full-stack web development environment.

There are tons of great editors out there. If you are just getting started then Atom (https://atom.io/) would be a great free choice. If you are willing to pay for a polished editor that also has SFTP features then look into applications like Panic's Coda (https://panic.com/), or an old standby BBEdit (http://www.barebones.com/products/bbedit/).

One other indispensable we dev tool on Mac OS is CodeKit (http://incident57.com/codekit/).