Where do you get an external render engine, and how do you use it.

I looked online for a half hour and I couldn't find anything about external rendering or alternate render engines that made sense.

I found something that's called Pose2Lux but it seems to just be a script to export to another program, I'm not sure what that is.

What renderer would do a professional job and still be fast enough to be practical for animation i.e seconds per frame instead of minutes?

If you shoot a mime, do you need a silencer?