<p>The <big>Factor programming language</big> combines <a href="http://concatenative.org/wiki/view/Factor/Features/The%20language">powerful language features</a> with a <a href="http://docs.factorcode.org/content/article-vocab-index.html">full-featured library</a>. The implementation is <a href="http://concatenative.org/wiki/view/Factor/Optimizing%20compiler">fully compiled</a> for performance, while still supporting <a href="http://concatenative.org/wiki/view/Factor/Interactive development">interactive development</a>. Factor applications are portable between all common platforms. Factor can <a href="http://concatenative.org/wiki/view/Factor/Deployment">deploy stand-alone applications</a> on all platforms. Full source code for the Factor project is available under a <a href="http://factorcode.org/license.txt">BSD license</a>.</p>
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<li>Screenshots: <a href="http://factorcode.org/factor-macosx.png">Mac OS X</a>, <a href="http://factorcode.org/factor-windows7.png">Windows</a></li>
<li><a href="http://concatenative.org/wiki/view/Factor">Learn more about Factor</a></li>
<li><a href="http://concatenative.org/wiki/view/Factor/Learning">Get started programming with Factor</a></li>
<li><a href="http://concatenative.org/wiki/view/Factor/FAQ">Get answers to frequently-asked questions</a></li>
<p>Most of the above links point to pages on the <a href="http://concatenative.org">concatenative.org wiki</a>.</p>
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<h1>Show me some code!</h1>
<p>Factor belongs to the family of <em><a href="http://concatenative.org/wiki/view/Concatenative%20language">concatenative languages</a></em>: this means that, at the lowest level, a Factor program is a series of words (functions) that manipulate a stack of references to dynamically-typed values. This gives the language a powerful foundation which allows many abstractions and paradigms to be built on top. Reload this page to see a random code example below.</p>
<p>To download a binary, follow the link corresponding to your computer's CPU/OS configuration. Binary packages are the recommended route for new users who wish to try Factor.</p>
<p>Stable and development releases are built and uploaded by the <a href="http://concatenative.org/wiki/view/Factor/Build farm">build farm</a>. Follow <a href="http://twitter.com/FactorBuilds">@FactorBuilds</a> on Twitter to receive notifications. If you're curious, take a look at the <a href="http://builds.factorcode.org/dashboard">build farm dashboard</a>.</p>
<p><b>Source code</b> is stored in our <a href="http://concatenative.org/wiki/view/Factor/GIT repository">GIT repository</a>. Source can can be browsed online via <a href="http://github.com/factor/factor/">github</a> or <a href="http://gitweb.factorcode.org/">gitweb</a>.</p>