Plater
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3D-printer parts placer and plate generator
It's much more compact in size among other benefits and is already supported by all major slicers
I would personally like this to allow clustering to the centre of the build plate. But there could be alignment against each edge, along the x centre-line, y centre-line, or...
See example; on Mac, building from source, only the bottom left quarter of the window shows the view, even when zoomed. 
Have you though on adding something like https://github.com/nallath/CuraOrientationPlugin ? It works really well in Cura (I use it all the time). I know it is a dumb nuance but with...