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I want to try a tiling window manager for OSX like this one:

I found a tool to remove window shadow here:

But nothing to remove window decoration (border, title, close button...), do you have an idea?

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I found this SIMBL plugin for removing the traffic light buttons, but I don't know how to build it. – user495470 Mar 11 '13 at 8:50
@Lri - Build with XCode, works perfectly for me. I too am looking for a way (perhaps a SIMBL plugin) to disable Window Border/Frame. – J.B. Jul 17 '14 at 18:15

It's easy to do with simbl: Look for for a sample of the simbl plugin that disable all these things for the iPhone simulator.

If you need it for a special application, just ask it and I'll send you the compiled SIMBL plugin

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Only the frontmost window has this huge shadow, it's smaller for background windows. So you can try screenshotting non-focused windows (easy if you activate e.g. Mail and close all its windows, so no window has focus). However you would have to live with the deactivated, washed out look or manually merge both deactivated and active window screenshots.

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