fjolnir/afloat — pull request #1 by ProLoser (2014-10-21 21:23:47+00:00)
Title: Enable right-click-drag resizing from any corner or side, X11-style

There used to be a feature where you held CTRL + OPTION + CMND and right-click-drag to resize a window (left click would move the window). I'm curious if this is that feature.