This is a tough question. Since I started rendering in LuxRender, I've stopped using the two most used freebies that I couldn't live without for the longest time. 1: BB Sphere because Reality has its own props for that. 2: EZ Skin I don't use anymore also because Reality doesn't like the advanced materials it produces.

I think that everything I'm using now on a constant basis have been purchases and I seldom use freebies atm.