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http://javaranch.com/ which is primarily a Java focused site but they have been re-branding it as http://coderanch.com/ for a while now to bring in discussions for various other programming languages and programming/engineering in general http://www.coderanch.com/t/660249/Wiki/Code-Ranch-Domain.

They have been around for a while now http://www.javaranch.com/JRhistory.jsp

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They do have a couple of rules there - 1. Be Nice 2. They strictly enforce their naming policy wherein they expect users to have a real _sounding_ display name.