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# Build Free Multi-Tier apps with DA/JavaScript + Relativity Server
- URL: https://blogs.remobjects.com/2012/07/13/javascript-relativity-is-everywhere-and-free/
- Published: 2012-07-13T17:06:08.000Z
- Updated: 2018-08-22T06:17:41.000Z
- Author: jim
- Tags: #Import 2026-08-17 20:17

With the recent Summer 2012 release we have now made [Data Abstract for JavaScript](http://remobjects.com/da/javascript?ref=blogs.remobjects.com) available as a completely free product edition with its own installer, in addition to being included in our other platform editions (for .NET, Delphi and Xcode).

When combining this on the back-end with our Relativity Server (which is also available in a royalty-free edition that runs on Windows, Linux and Mac OS X), you now have the ability to build powerful Data Abstract-driven multi-tier projects, all with completely free tools from RemObjects Software.

**Data Abstract for JavaScript** is a 100% native JavaScript implementation of our client libraries, and lets you create rich standards-based web applications on top of the HTML+JS stack that runs in the web browser. It also integrates with the new Visual Studio 2012 from Microsoft to let you build HTML-based Metro applications for Windows 8 (the Free DA/JS installer comes with full IDE integration, our New Project, and everything needed to get you started).

**Relativity Server** is our pre-built “middle tier in a box” built on our DA/.NET framework, and lets you serve up to two independent middle-tier projects in the free edition.

Both Data Abstract for JavaScript and Relativity Server are available on our [Free Downloads](http://www.remobjects.com/downloads?ref=blogs.remobjects.com) page.

Click thru to learn more about [Data Abstract for JavaScript](http://www.remobjects.com/da/javascript?ref=blogs.remobjects.com) and [Relativity Server](http://www.remobjects.com/da/relativity?ref=blogs.remobjects.com), or watch our “[Metro App Development with Data Abstract for JavaScript](http://www.remobjects.com/tv/da.aspx?video=da-09-metro-javascript&ref=blogs.remobjects.com)” video below: