Atom is Github's text editor, at the time of this writing it's still in private beta.

It uses Chromium Embedded at it's core, and integrates with node.js. It provides easy access to extensibility features, including an autocompletion API.

The result is that you will likely soon be looking at an editor that features full node.js autocompletion in javascript and coffeescript.

Everything you see in your editor window is in a DOM. This is akin to Codemirror or Ace. Meaning you get both the benefit of debugging your extensions with a webkit console, and the harm of having dom overhead everywhere in your text buffer.

Since the main editor is essentially a browser, you can also preview html directly in the same window. At the time of this writing you can live preview your markdown like with other markdown editors based on similar technology. Currently it's not possible to preview other html pages in there, but it's likely that this is in the works.

Atom is clearly an early look at a new code editor and much work remains to be done to produce a good community, a wide array of plugins as well as improving upon the performance of the product.

That aside, GitHub clearly cares about this product and is working hard to produce something that may well be great. Feedback has been responded to promptly and updates are rolling out to address issues.

The process of producing and publishing plugins is very smooth with a good set of tools to assist in the progress. Documentation is still in progress.

There are still performance problems with larger files and really large files can't be loaded at all. However, this is still a beta, so it remains to be seen what happens here.

Atom is a great editor that feels very familiar if you're used to Sublime Text. The UI is almost copied verbatim and you will feel right at home.

It comes with a package manager built right into the system, with plugins as a first class citizen.

All of this greatness comes to a screeching halt though:

1. You cannot open files larger than 2MB.
2. It's built on Webkit so it's slow as molasses.

Visual Studio Code takes writing code to the next level.

There is a great community out there, it is open source, it is lightning fast, and it just works out of the box.

It has a TON of useful extensions that can make the software do just about anything that you can imagine. It has GIT support directly within the software that doesn't require any extra plugins or configuration.

I have been using VS code to develop Angular 2 application, it is great a highly support of Angular Directives and Services within HTML tags. It ease the development process of understanding syntax as a beginner in web development

I use atom in every bit of programming from markup, styling to customised autocomplete for python and JS. Nuclide theme is an awesome tool for React Native which is light version of both Android Studio and XCode.

There are many Text Editors and IDEs available for PHP. Sublime Text is the best of all. I have tried other Text Editors, but Sublime does not leave me at all. I'm used to it and keep using till the end.

It is truly a hackable editor but along with that it's very slow and takes lots of memory.