Maya
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Documentation is outdated.
meTools for Afanasy
http://meshstudio.blogspot.ru/2013/01/metools-for-afanasy.html
Maya VRay, Arnold and MentalRay standalone rendering.
Stand-Alone Dialog
Use AfStarter
The Simplest MEL Dialog
Afanasy menuitem in CGRU raises a window. Dialog is minimalistic but enough to do anything that needed in most cases. It can render any engine type: Software, VRay, Arnold, MentalRay or whatever. It simple runs Maya Render command and ask it to open scene and render special frame(s). All render settings Maya takes from render globals in this case.
CGRU Maya
A set of MEL scripts and a plug-in.
Documentation: