Well, it depends on what I&#x27;m doing.<p>If I&#x27;m doing some front-end stuff, I&#x27;ll use Javascript.  I most certainly <i>will not</i> use something like GWT because I want my entire codebase to be Java-only.<p>I&#x27;ve used Ruby, Python, and others.  I&#x27;d like to get back into Haskell at some point when I find the time.  My current little side project is written using (mostly) Go and Javascript (I&#x27;ll have to post a &quot;Show HN&quot; sometime, maybe).<p>Right now I&#x27;m really digging Go for network services :)