One plugin on a long list that I use in every scene but I haven't taken the time to review. I'm trying to be better about that!
Embody is what makes this first-person experience WORK. Sure, possession can get you part way there (and takes a bit to set up how you want it) but this brings first person in VaM and the ease of use to the masses (meaning both VR and desktop users) while being highly configurable for any creator to embed in their scenes. Bring older scenes to life by adding this to your favorite Atom and you're set!
I can't imagine there are people out there who haven't downloaded this already, but if you're one of them, do so immediately!