anyone know of any gui's that use vp9?

as the title suggests, i would like to play around with vp9 but i can't find any software that supports it, does anyone know of any.

and yes, i know about Hybrid but with apologies to Selur the software is really poorly written, it's buggy as hell, the interface is not well designed at all and half the time the encode fails for no apparent reason at all.

so if anyone knows how i can encode some vp9, that would be appreciated.