Over the last week or so I’ve spent a few hours learning a bit about DerbyJS – an all-in-one app framework for developing collaborative apps for the web . You can read more about DerbyJS itself at derbyjs.com, but here are six highlights that I’m excited about (text version below the video):
1. The browser reflects dev changes immediately. While developing, derbyjs automatically reflects any changes you make to styles, templates (and scripts?) as soon as you save. No need to switch windows and refresh, instead they’re pushed out to your browser(s).
2. Separation of templates (views) and controllers. Derbyjs provides a model-view-controller framework that we’ve come to expect, with Handlebars-like templates and trivial binding to any event handlers defined in your controller. Derby also provides standard conventions for file locations and bundles your files for you.
3. Model data is bound to the view – derbyjs automatically updates other parts of your templates that refer to any data which the user changes, but that’s not all…
4. Model data is synced real-time (as you type/edit) – updating the data you are changing in all browsers viewing the same page. The data just synchronises (and resolves conflicts) without me caring how. (OK, well I really do care how, but I don’t *need* to care).
5. The same code runs on both the (node) server and the browser. The code that renders a page after a server request (great for initial page load and search indexing) is one and the same code that renders pages in the browser without (necessarily) hitting the server.
6. My app works offline out of the box. That’s right – as per the demo – any changes made while offline are automatically synced back to the server and pushed out to other clients as soon as a connection is re-established.
It’s still early days for DerbyJS, but it looks very promising – opening up the doors to loads of people with great ideas for collaborative apps who don’t have the time to implement their own socket.io real-time communication or conflict resolution. Hats off to the DerbyJS team and community!
 After doing similar experiments in other JS frameworks (see here and here), and being faced with the work of implementing all the server-sync, sockets, authentication etc. myself, I went looking and found both meteorjs and derbyjs. You can read a good comparison of meteorjs and derbyjs by the derbyjs folk (Note: both are now MIT licensed).