Now that TideSDK is effectively dead, I&#39;ve been looking into alternative &#39;wrappers&#39; to run HTML/CSS/JS applications as stand-alone desktop applications. The three viable options I have run across so far, are [NW.js](https://github.com/nwjs/nw.js) (formerly node-webkit), [brackets-shell](https://github.com/adobe/brackets-shell), and [Electron](https://github.com/atom/electron/) (formerly atom-shell).

The problem is that there does not appear to be a sufficiently complete comparison between the three in terms of feature set, compatibility, etc. I&#39;m hoping to turn this into a more-or-less canonical thread on the (objective) differences between the three, in particular regarding:

 * **Platform support**; operating systems, dependencies, etc.
 * **Language feature support**, as far as HTML5, CSS3 and JavaScript are concerned. Think things like *&quot;does HTML5 video work, and if yes, what codecs are available?&quot;*
 * **Non-standard extra features**, such as tray icons, popup notifications, and OS-rendered menu bars.
 * **Extensibility**; eg. ability to &#39;plug in&#39; native code, talk to Node.js, and so on.
 * **Architecture**; in particular the architectural differences that affect daily usage as a developer.
 * **Debugging**; included development tools, compatibility with commonly used tools like `node-inspector`, etc.
 * ... and so on.

What are the objective, technical differences that matter when making a choice between them as an application developer?

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What are the functional differences between NW.js, Brackets-Shell and Electron?