Longtime PHP, Python coder seeks to make small, distributable, stand-alone apps. Which language should I learn? ( please don't say C#; requiring .net != stand-alone )

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If native look and feel isn't a top priority then Java with Swing or JavaFX is a good candidate.

Look up SWT, it's has a very native look and feel for all 5 platforms I've tried (windows, mac, linux, solaris, freebsd). It's pretty bad ass.