Anyway to find all free dlc for games a person owns on steam?

I remember there used to be a list of all the free dlc available somewhere.
Can't remember where, you could google it(I'm on the phone/lazy).

not sure potato has dlc...

http://grabfreegames.com/free-game/81-free-dlcs-on-steam-steam-dlc

18months since last update, so im sure its rather incomplete but IndieKings Discussion here that will at least get you started.

It's possible if you know the coding things.